3 in 1 vs 7 in 1 pool test strips: which extra pads
Updated: 21 October 2026
You are choosing between a three-pad bottle and a seven-pad bottle. On 3 in 1 vs 7 in 1 pool test strips, the extra pads earn their place only when you will act on cyanuric acid, hardness or total chlorine, and only when you can tell those colours apart. We used the amazon.co.uk listings in the [pool test strips comparison](/hub/pool-care/pool-test-strips) on 19 October 2026. Count, chart and opened life stay on the [pool test strips buying guide](/hub/pool-care/pool-test-strips/sub/pool-test-strips-buying-guide). A qualifying purchase can earn a commission at no extra cost to you.
You are choosing between a three-pad bottle and a seven-pad bottle.
You are choosing between a three-pad bottle and a seven-pad bottle. On 3 in 1 vs 7 in 1 pool test strips, the extra pads earn their place only when you will act on cyanuric acid, hardness or total chlorine, and only when you can tell those colours apart. We used the amazon.co.uk listings in the pool test strips comparison on 19 October 2026. Count, chart and opened life stay on the pool test strips buying guide. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Pads named | Cyanuric acid | Opened life | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Clearwater Clearwater 4-in-1 test strips, 50 | Chlorine, pH, alkalinity, bromine | No | not stated | 7.1 | about £9.99 | View offer |
| Best value |  HOVIRAN HOVIRAN 3-in-1 pool test strips, 125 | 4 on the uses line; title says 3-in-1 | No | not stated | 6.9 | about £7.29 | View offer |
 EASYTEST EASYTEST 7-way pool test strips, 150 | 7, including hardness and total chlorine | Yes | 90 days | 9.0 | about £15.99 | View offer |
On this page
What the two bottles actually measure
The short bottles cover sanitiser, pH and alkalinity, sometimes with bromine beside chlorine. Both Clearwater packs name chlorine, pH, alkalinity and bromine. HOVIRAN at £7.29 is titled 3-in-1 and the uses line lists four names. VivaTest at £9.95 does not name bromine. None of those short lists includes cyanuric acid.
The seven-way listings add total hardness, cyanuric acid and total chlorine. Dr.Tim.Wang at £14.24, the EASYTEST 7-way at £15.99, HLLNWB at £7.99 and FIXINGS DIRECT at £13.99 name that wider set. Nacerlary at £10.99 for 175 strips uses six pads: chlorine and bromine share one. Total chlorine beside free chlorine is how you see combined chlorine. A single chlorine pad cannot show that split. Do not paste another brand's bromine multiplier onto Nacerlary's shared pad.
When the extra pads earn their place
Buy the extra pads when a decision depends on them. An outdoor pool on trichlor is the clear case for cyanuric acid. PWTAG's code extract, for chlorinated isocyanurates, holds free chlorine at 2.5–5 mg/l and cyanuric acid at no more than 150 mg/l. Combined chlorine should stay below half the free chlorine and not above 1 mg/l. HSG282 wants combined chlorine ideally at zero and normally under 1 mg/l in a spa. A 3-in-1 that stops at one chlorine pad cannot show that gap.
Shop pages are tighter than that ceiling, and they are not the same claim. DP Pool Services gives a residential 30–50 mg/l target. Do not merge those into one correct cyanuric acid. Quote the source you are following.
AquaChek yellow is the middle buy when cyanuric acid is the only extra you will act on. It is £12.15 for 50 strips, 4.7 from 14,399, and it names free chlorine, pH, total alkalinity and cyanuric acid. It does not name bromine.
When a short strip is the better buy
A hot tub's daily job is sanitiser, pH and alkalinity before anyone gets in. BISHTA's domestic band is chlorine 3–5 mg/l or bromine 2–4 mg/l, pH 7.0–7.6 and alkalinity 80–120 mg/l. A hardness pad every morning does not change that routine. The tub's own bands are on hot tub test strips.
Clearwater is the short-strip case with the stronger UK chart comments. HOVIRAN at £7.29 covers free chlorine, bromine, alkalinity and pH on the uses line if you accept a title that claims seven parameters. For a bromine tub, a bottle that names bromine beats AquaChek yellow and VivaTest, which do not.
Fewer pads do not help on Canadian Spa at £5.99, where reviews say the colours will not sit on a block.
Labels that do not match the pads
HOVIRAN's title says 3-in-1, a bullet says seven parameters, and the uses line names four tests. That is a four-name bottle with a louder bullet. Nacerlary's title says 7-in-1 and the chemistry is six pads, because chlorine and bromine share one.
Readability still beats the pad count. The EASYTEST 7-way is £15.99, 4.5 from 20,849, with 90 days after opening, and two UK reviews say the cyanuric acid pad stayed low. For a hot tub, buy the short strip that names your sanitiser, and do not pay for hardness you will not dose. For an outdoor trichlor pool, buy a readable cyanuric acid pad: AquaChek yellow if you do not need bromine or total chlorine, or a seven-way if you will recheck a cyanuric acid pad that looks stuck. The best hot tub test strips page says who should leave each bottle on the shelf.
Common questions
Is a 7-in-1 more accurate than a 3-in-1?
No. It measures more parameters. Accuracy is whether you can match the colour, and UK reviews on some seven-way bottles describe charts that do not match or a cyanuric acid pad stuck near zero. A short Clearwater strip can be the better reading for chlorine, pH and alkalinity. Neither style was lab-tested here, and a star line is not a laboratory score.
Do I need cyanuric acid on the strip?
You need it when the pool is outdoors on trichlor or dichlor and you will act on the result. PWTAG’s extract caps cyanuric acid at 150 mg/l on isocyanurate pools and puts free chlorine at 2.5–5 mg/l. Shop pages often say 30–50 mg/l. Those are different claims. A hot tub does not gain a daily cyanuric acid job from a 7-in-1 title.
What is the point of total chlorine if I already have free chlorine?
Combined chlorine is the gap between them. PWTAG wants that gap below half the free chlorine and not above 1 mg/l. HSG282 wants it ideally at zero and normally under 1 mg/l in a spa. One chlorine pad cannot show the gap. The pad is wasted if you never subtract the two readings.
Why do some bottles say six pads and seven tests?
Nacerlary’s listing does. Free chlorine and bromine share one pad, and the title still says 7-in-1. You read that pad on the scale for the sanitiser you use. You do not get two independent answers, and you do not multiply the colour by a factor printed on a different brand’s page.
Which bottle in this set is 3-in-1 and which is 7-in-1?
Short lists: EASYTEST B09MW354JK, VivaTest B0GHT7K7SY, both Clearwater packs, HOVIRAN B0DWX46SW2 with a conflicting seven bullet, and Canadian Spa B07DYCCM2B. AquaChek B003TQM9XS is four tests and adds only cyanuric acid. Seven-name bottles: Dr.Tim.Wang B0CNLQ3PQK, EASYTEST B09MSY8BLB, HLLNWB B0DJ2Z9344, FIXINGS DIRECT B0HBCYFS1D, and Nacerlary B0FZQG4B93 on six pads. The main table has the prices.
Related pages
Sources
Public UK sources for pool and spa water targets, taken from the research digest. Listing prices, stars and review counts are from amazon.co.uk on 19 October 2026. No bottle here is a PWTAG approval.
- HSE — swimming pool safety (retrieved 19 October 2026)
- PWTAG code of practice (retrieved 19 October 2026)
- PWTAG standards (retrieved 19 October 2026)
- HSE — HSG282, control of legionella and other infectious agents in spa-pool systems (retrieved 19 October 2026)
- BISHTA — water treatment (retrieved 19 October 2026)
- BISHTA — daily, weekly, monthly and annual hot tub checks (retrieved 19 October 2026)
- Lovibond UK leisure — water testing (retrieved 19 October 2026)
- Amazon.co.uk best sellers — Pool & Hot Tub Testers (retrieved 19 October 2026)