The best dosing floats, compared.
Top pick: EduPlayte 5 inch float Best value: Steinbach Mini 20 g float – About £5.39 for a 20 g float with 4.4 from 2,370 reviews. Two UK reviews say the lid was missing. Updated 22.10.2026.
A dosing float is a floating plastic chamber that holds pool or spa disinfectant tablets and lets water reach them through slots or a ring. In the UK you buy one for a garden pool, a paddling pool, or a hot tub so slow tablets do not sit on the liner. The float does not measure chlorine, correct pH, or shock a green pool. Tablets are sold separately, and the chemical on the tablet label is the dose, not the shape of the float. You recognise a suitable float by the tablet size named on the listing, one chemistry in the chamber, a lid that arrives with it, and a ring that turns without spinning the whole base. A 20 g mini is the wrong chamber for a large puck. Do not mix chlorine and bromine, or add acid or calcium hypochlorite. In a hot tub or a vinyl pool, move the float so it does not rub the shell. The types, from a mini to a solar lamp, are set out in the [dosing float buying guide](/hub/diy-supplies/dosing-float/sub/dosing-float-buying-guide).
A dosing float is a floating plastic chamber that holds pool or spa disinfectant tablets and lets water reach them through slots or a ring.
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Personal buying guide
Question 1 of 2
Which tablets are already in the cupboard?
The EduPlayte listing is a polypropylene float at £4.99 with a dosage ring, a screw lid, and a foldable body. The title says 5 inch, which describes the float, not a tablet; grams and inches for the tablet are not stated. The listing says you open it, add tablets, screw the lid on, set the flow, and wear gloves, and it names no tools. It shows 5.0 from one review, and the saved listing has no review text, so that star line is not a comparison. Bullets name pools, spas, hot tubs, fountains, water parks, and aquariums. Pool chlorine tablets do not belong in a fish tank. At the bottom of the price band you get a ring on the page, not a checked 20 g match.
Pros
Cons
Best for: You want a cheap polypropylene holder with a stated ring and you already know which tablets fit a body this size.
Less suitable: You need a stated 20 g or 3 inch capacity, or a review history you can read.
Specifications
Common questions
Will it fit a hot tub?
The bullets name hot tubs, spas, pools, fountains, and water parks. They also name aquariums, which is not a reason to use pool chlorine tablets in a fish tank.
Do you need tools?
The listing says open it, add tablets, screw the lid on, set the flow, and put it in the water. No tools are named. It says to wear gloves.
What tablet size does it take?
The saved listing does not state grams or inches. The title says 5 inch, which is the float, not a tablet size.
The Feirdhoo title says a 5 inch adjustable float with a thermometer, for chlorination and bromination of swimming pools, and it names hot tubs, at £10.57. The technical table says 8 × 8 × 1 cm and 50 g, which is not reconciled with a 5 inch title. The only feature bullet is the digit 1. It shows 5.0 from one review, and the saved listing has no review text. Tablet size in grams or inches is not stated. Those two size lines cannot both describe the same chamber. You cannot treat the title as a measured fit until the listing agrees with itself.
Pros
Cons
Best for: You are comparing title claims only, and you will measure the float before you trust a tablet in it.
Less suitable: You need one agreed size, a stated tablet, or a written review.
Specifications
Common questions
How big is it?
The title says 5 inch. The technical table says 8 × 8 × 1 cm and 50 g. Those figures are not reconciled in the saved listing.
Does it dose bromine as well as chlorine?
The title says chlorination and bromination of swimming pools, and it names hot tubs. The only feature bullet is the digit 1.
Is there a written review?
The listing shows 5.0 from 1 review. The saved listing has no review text.
The Steinbach Mini 79050 is listed for 20 g tablets at £5.39, with 4.4 from 2,370 amazon.co.uk reviews, the largest review count in this set. UK buyers say it still does the job. Two United Kingdom reviews say the lid shown in the listing was missing. One UK review says the blue ring will not turn on its own because the whole base spins, so that buyer could not set the dose. The bullets do not describe a ring, and material and warranty are not stated. The listing does not give a 3 inch capacity. It is the best value here when your tablets are 20 g and you will check the box for a lid on the day it arrives.
Pros
Cons
Best for: You use 20 g tablets and want the review history at £5.39, and you will return it if the lid is missing.
Less suitable: You need the pictured lid to be certain, or you need the ring to turn on day one.
Specifications
Common questions
Which tablets fit the Steinbach Mini?
The listing names 20 g tablets. It does not give a 3 inch capacity.
Does the lid come in the box?
Two United Kingdom reviews say the lid shown was missing. Other UK reviews say it still does the job.
Can you turn the dose down?
One United Kingdom review says the blue ring will not turn on its own because the whole base spins, so that buyer could not adjust the dose. The bullets do not describe a ring.
The Gre FDP20 is an ABS dosing float listed for 20 g tablets at £11.82, and it carries 4.3 from 427 amazon.co.uk reviews. UK reviews in this file say it holds the tablets. One United Kingdom review reports a black mark where the float rubbed a hot tub, so you still move it rather than leave it against the shell. The bullets claim a four-year warranty, though the saved listing does not include the warranty terms. Adjustable flow is not stated, and the item-type field says Brush, which conflicts with a float. Tablets are not described as included. For a named 20 g holder with a stated material and a large UK review count, this is the top pick in the set, with that rub mark kept in view.
Pros
Cons
Best for: You already use 20 g tablets in a garden pool and want a named ABS float with a large UK review count.
Less suitable: You want a £5 holder, 3 inch pucks, or a float you can leave against a hot-tub shell.
Specifications
Common questions
Which tablets fit the Gre FDP20?
The listing says 20 g tablets. It does not state a 3 inch or 200 g size. Tablets are not described as included.
Is it suitable for a hot tub?
The bullets do not answer the saltwater question and do not name hot tubs. One United Kingdom review says it left a black mark where it rubbed a hot tub.
What warranty is stated?
The bullets say a four-year warranty. The saved listing does not include the warranty terms.
The ZWOOS solar RGB float is £26.99 in ABS, listed at 19 × 18 × 12 cm and 550 g, with an empty tablet basket. The bullets claim up to four 3 inch tablets, or many 1–2.5 inch tablets, not included, plus a remote and eight light colours. IP68 and 8–12 hours after a full charge from a 1200 mAh pack are the seller's wording. The listing says one AA battery is required and does not say the cell is in the box. It scores 4.3 from 89 reviews, and none of those reviews in the file are from the United Kingdom. Other countries praise the light and complain about a fussy basket, a base or panel that comes off, and a light that failed after water got in. You are buying a lamp with a basket, not a better 20 g doser.
Pros
Cons
Best for: You want a solar pool light that can also hold large tablets, and you accept non-UK reviews only.
Less suitable: You only need a 20 g chlorine holder, or you want United Kingdom reviews of the basket.
Specifications
Common questions
Are the chlorine tablets included?
The title says the float for chlorine tablets is empty. The bullets say up to four 3 inch tablets, or many 1–2.5 inch tablets, are not included.
What battery does the listing require?
It says 1 AA battery is required, claims a 1200 mAh pack and 8–12 hours after a full charge, and says the solar panel must face up. IP68 is the seller's wording.
What do the reviews say about the basket?
No United Kingdom review is in the file. Other countries mention a basket that is fussy about tablet size, a base or panel that comes off, and a light that failed after water got in.
The Gaethra two-pack of solar chlorine floats is £37.44. The bullets say the chamber holds four 3 inch tablets, or more 1 inch chlorine or bromine tablets, not included, and they do not tell you to combine the two chemicals in one fill. The technical table says 8 × 7 × 6 cm and 1.03 kg, which conflicts with four 3 inch tablets. Lithium-ion batteries are included, with a remote and seven colours claimed. Two Spanish reviews say there is no thermometer. It scores 4.3 from 21 reviews, and there is no United Kingdom review in the file. Praise in those reviews is the light, while faults include one dead unit and a failed solar charge, so you are paying for two lamps whose centimetre line does not support the tablet claim.
Pros
Cons
Best for: You want two solar lights and you will ignore the tablet-capacity line until the size table matches it.
Less suitable: You need a 20 g holder, a thermometer, or a chamber whose centimetres agree with the tablet claim.
Specifications
Common questions
Does this pack include a thermometer?
The bullets do not list a thermometer. Two Spanish reviews say there is not one, including buyers who had expected it from a title.
Can you use bromine tablets?
The bullets say four 3 inch, or more 1 inch, chlorine or bromine tablets, not included. They do not say to combine the two in one fill.
Do the dimensions match the tablet claim?
The technical table says 8 × 7 × 6 cm and 1.03 kg. The bullets say the chamber holds four 3 inch tablets. Those two statements conflict. No United Kingdom review is in the file.
The Jonuin PVC turtle floater is £12.99 and claims up to five 3 inch tablets or forty 1 inch tablets, which are not included, plus a bottom control ring. It scores 4.1 from four reviews. Three UK texts are in the file: two buyers were satisfied with the looks and with large tablets, and one says the turtle's back arrived damaged and could not be fixed. The title calls it a bromine holder. Weight is listed as 340 g. A cracked shell is a problem with that delivery, not proof that every turtle fails. It is a large-tablet shell when the one you receive is intact, not a 20 g mini.
Pros
Cons
Best for: You use 1 inch or 3 inch tablets and want an animal shell, and you will return a cracked one.
Less suitable: You use 20 g tablets only, or you need a float that arrived intact in every UK review.
Specifications
Common questions
How many tablets does the turtle claim to hold?
The bullets say up to five 3 inch or forty 1 inch tablets, not included. A UK review says it is good for the big round tablets.
Can it hold bromine?
The title calls it a bromine holder. A page question asks the same thing. The bullets do not add a separate sentence.
Did UK buyers receive it intact?
One United Kingdom review says the turtle's back arrived damaged and could not be fixed. Two others were satisfied with looks and with large tablets.
The ZWOOS pack of two uses the same model code, TYN-XDH, and the same light and tablet claims as the single solar float, at £38.99 against £26.99 for one. Dimensions are listed as 19 × 18 × 12 cm and the pack weight as 1.02 kg. The bullets again claim up to four 3 inch tablets, or many 1–2.5 inch tablets, not included. It scores 4.0 from one review, written in France, which calls the night light pleasant and the diffuser a bit fragile. There is no United Kingdom review in the file. The listing says one AA battery is required and does not say the cell is included. Two of the same lamp only make sense if you already want a pair of lights.
Pros
Cons
Best for: You have already decided you want two ZWOOS lights and you accept a single non-UK note on the diffuser.
Less suitable: You want one lamp, a 20 g mini, or a United Kingdom review of the pair.
Specifications
Common questions
How is this different from the single ZWOOS float?
The saved listing uses the same model code, TYN-XDH, and the same light and tablet claims. This listing is a pack of two at £38.99, against £26.99 for one.
What did the only review say?
One review, from France, says it is pleasant at night and that the diffuser is a bit fragile. There is no United Kingdom review in the file.
What battery does it ask for?
The listing says 1 AA battery is required and claims 1200 mAh with 8–12 hours after a full charge. It does not say the AA cell is included. Tablets are not included.
The Acunny PVC float is £5.75. The title says it is a dosing float with a thermometer, and the bullets claim adjustable rings plus a lockable cover that keeps the tablets in. There is no separate specification line for the thermometer, and there is no amazon.co.uk review line in the saved listing, so neither the thermometer nor the lock is checked by a buyer in this set. No tablet size is given. The bullets name spas, hot tubs, and ground pools. You would be buying a title claim and a lockable-cover sentence, not a reviewed 20 g holder. Weight, dimensions, and warranty are not stated.
Pros
Cons
Best for: You want a PVC float whose title claims a thermometer, and you accept that nobody in this file has reviewed it.
Less suitable: You need a stated tablet size or a UK review that confirms the thermometer.
Specifications
Common questions
Does it include a thermometer?
The title says dosing float with thermometer. There is no separate specification line and no review to confirm it.
Where does the listing say you can use it?
The bullets name spas, hot tubs, and ground pools. No tablet size is given.
Is the cover lockable?
The bullets say a lockable cover keeps the tablets in. No review checks that claim.
The NEIQIUWING white plastic float is listed for 1.5 inch tablets at £6.36, and the height is given as about 12 cm. The bullets claim a thermometer that shows Celsius and Fahrenheit. There is no review line in the saved listing, so nobody in this set has checked the reading or whether a 1.5 inch tablet actually seats. The listing does not mention 20 g or 3 inch tablets. Bullets name recessed pools, above-ground pools, massage baths, and indoor and outdoor spas. Adjustable flow is not stated. It is the only row that writes 1.5 inch, which helps only if that is the tablet already in your cupboard.
Pros
Cons
Best for: You already own 1.5 inch tablets and want the only listing in this set that names that size.
Less suitable: You use 20 g minis or 3 inch pucks, or you want reviews before you buy.
Specifications
Common questions
What tablet size does it take?
The listing says 1.5 inch. It does not mention 20 g or 3 inch tablets.
Does the thermometer show Celsius?
The bullets say the meter shows Celsius and Fahrenheit. There is no review of the reading.
Can it go in a spa?
The bullets name recessed pools, above-ground pools, massage baths, and indoor and outdoor spas. Height is given as about 12 cm.
The Lempefe animal floater is £20. The title names both a tortoise and a crocodile, and it names 1 inch and 3 inch tablets, without saying which shape is in the box. The technical table says 23.7 × 18 × 23 cm. Power source is listed as 1, which is not a usable figure. There is no material, no hot-tub sentence, and no review line in the file. Adjustable flow is not stated. At the top of the non-solar prices you are paying for an animal shape the listing does not pin down. Nothing in the file shows whether a 3 inch puck seats in that body.
Pros
Cons
Best for: You want a large animal-shaped holder and you can see, before you pay, which animal the seller will send.
Less suitable: You need a stated material, a UK review, or a 20 g mini.
Specifications
Common questions
Is it a tortoise or a crocodile?
The title names both. The bullets repeat the title and do not say which shape is in the box.
Which tablets does the title name?
1 inch and 3 inch. No material, no hot-tub sentence, and no review line are in the file.
What are the stated dimensions?
The technical table says 23.7 × 18 × 23 cm. Power source is listed as 1, which is not a usable figure.
Shelf prices, stars and review notes are the amazon.co.uk figures already stored for these eleven listings. This is not a laboratory test. The number on each card is that stored display score divided by 10. In the display file the score is the star line times 20, so a missing review line is 0 and a 5.0 from one review can show as 10. That figure does not award a badge. Top pick and best value are the two stored awards, on two different 20 g floats. The weights below are the checks behind those awards. They sum to 100 and they are not a second formula for the card number.
Stated tablet size
25%A listing that names 20 g, 1 inch, 1.5 inch or 3 inch scores on this check. A blank size, or a centimetre line that fights the tablet claim, does not.
Review evidence
25%A large amazon.co.uk count you can read outranks a single 5.0 with no text. Reviews from outside the United Kingdom are not counted as UK experience.
Lid and adjustment
20%A lid that arrives, and a ring that turns without spinning the whole base, are the practical checks. A missing lid or a ring that spins the base is a deduction.
Place and material
15%A hot tub or vinyl pool needs a float you can move. A stated material is kept. A rub mark on a shell stays in the notes.
Price for the job
15%A cheap mini is a tablet holder. A solar unit is a lamp with a basket, so the higher shelf price does not make it the better doser.
Buy the tablet size and one chemistry before the shape of the shell. A dosing float holds tablets. It does not measure chlorine, correct pH, or shock a green pool. A solar model is a lamp with a basket.
A dosing float is a floating plastic chamber that holds pool or spa disinfectant tablets and lets water reach them through slots or a ring. In the UK you use one in a garden pool, a paddling pool, or a hot tub so slow tablets do not sit on the liner. The float does not measure chlorine, correct pH, or shock a green pool. Tablets are sold separately. The chemical on the tablet label is the dose, not the shape of the float. The first check is the tablet size the listing names.
A 200 g puck does not belong in a 20 g mini. A 1.5 inch tablet, a 1 inch tablet, and a 3 inch puck are different fits. Do not copy a 200 g label's two tablets per 32 m³ onto a mini.
Chlorine and bromine do not go in the same chamber, and acid, shock, and calcium hypochlorite stay out. In a hot tub or a vinyl pool, move the float. One UK review reports a black rub mark.
A 5.0 from one review, with no text, is not a comparison. Solar IP68 is a seller's lamp claim, not a dosing certificate. Reviews from outside the United Kingdom are not UK experience.
Name the tablet before the shell. Gre and Steinbach say 20 g. NEIQIUWING says 1.5 inch. Jonuin claims five 3 inch or forty 1 inch tablets. Solar listings claim up to four 3 inch tablets, and the Feirdhoo and Gaethra centimetre lines conflict with a large chamber. Use chlorine or bromine, not both, and do not add acid or calcium hypochlorite. Trichlor leaves cyanuric acid until you dilute. The 200 g example of about two tablets per 32 m³ is not a dose for a 20 g mini.
Steinbach is best value at about £5.39, with 4.4 from 2,370 reviews, and two UK reviews say the lid was missing. One UK review says the ring spins the base. Gre is the top pick at about £11.82, with 4.3 from 427 reviews, and one UK review reports a black rub mark on a hot tub. A 5.0 from one review does not lead. ZWOOS at about £26.99 and the two-packs near £37–£39 are lamps. HSG179 does not cover a private family pool or a stand-alone spa. A let spa is a different duty.
Three typical situations, each with a recommendation from this comparison.
You already use 20 g tablets in a garden pool and want a named ABS float with a large UK review count. The Gre FDP20 is the top pick at about £11.82, with 4.3 from 427 reviews. UK reviews say it holds the tablets. One UK review reports a black rub mark, so you still move it. It is the wrong float for a 3 inch puck.
You use 20 g tablets and want the larger review history at about £5.39. The Steinbach Mini is best value, with 4.4 from 2,370 reviews. UK buyers say it still doses. Two UK reviews say the lid was missing, and one says the ring spins the base. Check the box on the day it arrives.
You want a solar pool light that can also hold large tablets, and you accept that the review file has no United Kingdom text. The ZWOOS solar float is about £26.99 and claims up to four 3 inch tablets. It is a lamp with a basket, not a better 20 g doser. IP68 is the seller's wording.
The top pick is the Gre FDP20 20 g float at about £11.82. The card shows 8.6, the stored display score of 86 divided by 10. The listing names 20 g tablets and ABS, with 4.3 from 427 amazon.co.uk reviews. UK reviews say it holds the tablets. One UK review reports a black rub mark on a hot tub, and adjustable flow is not stated. Best value is the Steinbach Mini 20 g float at about £5.39. The card shows 8.8, from 4.4 across 2,370 reviews. Two UK reviews say the lid was missing, and one says the ring spins the base. EduPlayte and Feirdhoo show 10 from a single review with no text, and neither takes a badge. A solar listing is a lamp with a basket.
Steinbach Mini 20 g float
About £5.39 for a 20 g float with 4.4 from 2,370 reviews. Two UK reviews say the lid was missing.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources and the amazon.co.uk listings compared on this page. Updated 22.10.2026.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the amazon.co.uk figures already stored for this set. This is not a laboratory test.
