Gravity or suction sandblaster
Updated: 21.10.2026
Portable kit on amazon.co.uk covers a 510 ml pot on the gun and a 50 lb hopper on the floor. A gravity or suction sandblaster choice is about where the media sits, how you hold the gun, and where the grit lands. It is not about which title prints the higher PSI. The ten listings are on the [portable sandblaster comparison](/hub/compressors/portable-sandblaster). Trade CFM figures below are from other UK kits, not from these ASINs. This is not a lab test.
Portable kit on amazon.co.uk covers a 510 ml pot on the gun and a 50 lb hopper on the floor. A gravity or suction sandblaster choice is about where the media sits, how you hold the gun, and where the grit lands.
Portable kit on amazon.co.uk covers a 510 ml pot on the gun and a 50 lb hopper on the floor. A gravity or suction sandblaster choice is about where the media sits, how you hold the gun, and where the grit lands. It is not about which title prints the higher PSI. The ten listings are on the portable sandblaster comparison. Trade CFM figures below are from other UK kits, not from these ASINs. This is not a lab test.
Our top picks
| Badge | Product | Feed | Hopper | Water separator | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  InoKraft InoKraft basic kit | Gravity hopper | 900 cc | No | 7.4 | about £42.99 | View offer |
 InoKraft InoKraft premium kit | Gravity hopper | 900 cc | Yes | 7.9 | about £49.99 | View offer | |
| Alternative |  Estink Estink 50 lb hopper kit | Suction hopper | 50 lb | No | 3.6 | about £67.02 | View offer |
On this page
A pot on the gun
Gravity feed puts a small hopper on the gun and lets media fall into the airstream. In this set, LIYOU states 900 ml, both InoKraft kits state 900 cc, and the BGS 70056 states 510 ml. Fockety is a gravity gun whose hopper size is not stated. Gunson's 77155, a UK trade gun and not one of these ASINs, is the same type at 600 cc and 90 psi. You refill often.
The failure mode is gravity itself. UK reviews of the BGS gun say there is no flow adjustment and that grit falls out when you point the gun down. One account times a full load at about three seconds. Keep that pot roughly level. A metered InoKraft gun is the alternative in this set when you want a valve in the media path, and the premium kit adds the separator the basic kit omits.
Once the pot is the highest point and there is no control, the load leaves by gravity. For a small part you can rotate on the bench so the gun stays near level, gravity is the feed. The named kit for that spot work is on the best portable sandblaster page.
A hose and a hopper on the floor
Suction feed leaves the media in a container and pulls it up a hose. Estink, at £67.02, prints 90 PSI, a 15 ft hose, and a 50 lb hopper. The Ejoyous hopper kit, at £69.99, prints 120 PSI, 15 ft, and 50 lb. Fifty pounds is about 23 kg. Neither listing states CFM, nozzle bore, or thread, and neither says the hopper is a pressure vessel. The only UK review of the Ejoyous kit calls it an open-air suction-feed type.
The attraction is refill time. The cost is mess and a thin record of whether the gun keeps drawing. That Ejoyous review says grit goes everywhere and damp media means you should not use the kit.
A real pressure pot is a third machine. Sealey's SB998 is a pressurised vessel with a gauge and a rule that you depressurise before you open it. Do not borrow those steps onto Estink or Ejoyous, and do not skip them on a pot that does have a gauge. How to start, bleed, and clear a hose you do own is on the how to use a sandblasting gun page.
Air, not just a bigger tub
A larger hopper does not use less air. UK suction kits sold outside this set, such as the Clarke CPSB1, state about 10 cfm at the gun. That is their claim, and it is not a measurement of Estink or Ejoyous. Those two Amazon titles give you PSI and a hose length, and they stop. You cannot assume the 50 lb tub is gentler on a 24 litre compressor than a 5 mm gravity gun.
Suction fails shut when the media is damp, because the pickup has to lift a powder that has turned to paste. Gravity fails open, by dumping, or fails shut, as on the LIYOU outlet. A separator is not in either hopper box. Do not block an unstated nozzle down before you have seen the gun draw. These two listings never state a bore.
When to pick which
Choose gravity when the part is small, you can keep the gun roughly level, and you will refill a 510–900 ml pot. Within that feed, the premium InoKraft kit is the one with the separator, if the compressor can hold 60–120 PSI. Choose the basic kit only when a dryer is already fitted.
Choose suction when the part is outside and you accept the thin evidence on Estink and Ejoyous. Do not choose it because 50 lb sounds professional, or because 120 PSI is higher than 90. If the part fits in a box and you want the grit contained, leave both feeds for a sandblasting cabinet. A pressure pot, a wing, or a room you have to sweep afterwards is none of the above.
Common questions
Which feed uses less air?
Neither feed earns a free pass on a small compressor. LIYOU states 8.8–10.6 CFM and BGS states 169 l/min, both seller figures. Estink and the Ejoyous hopper kit state no CFM at all. A 50 lb tub is not proof the gun sips air.
Why does grit fall out when I tip the gun?
On the BGS 70056, UK reviews say there is no flow adjustment, so a 510 ml pot empties when you point it down. One account puts a full load at about three seconds. LIYOU's fault is the opposite: grit that never leaves a tiny outlet.
Will a 50 lb hopper strip more before I refill?
It holds more media, about 23 kg against a 900 ml pot that InoKraft reviewers empty in a few minutes. It does not prove a longer cut. Estink reviews describe two-second bursts and a stop after about ten minutes. Capacity is not runtime.
Is that hopper a pressure pot?
No. The only UK review of the Ejoyous kit calls it open-air suction. The listings do not describe a pressurised vessel or a gauge. Sealey's SB998 is that third type, with a depressurise-before-you-open rule.
When is a cabinet the real answer?
When the part fits in a box and you need the grit contained. Open gravity and open suction both throw media across the space. Do not expect a 50 lb title to behave like a cabinet because the hopper is large.
Related pages
Sources
HSE, legislation.gov.uk, CoolBlast, Sealey and Kue Group, plus the ten amazon.co.uk listings. Shelf prices, stars and review counts are the figures saved on 19 October 2026.
- COSHH 2002 Schedule 2 (retrieved 19 October 2026)
- HSE CN7: Silica and blasting (retrieved 19 October 2026)
- HSE INDG463: Respirable crystalline silica (retrieved 19 October 2026)
- HSE INDG178: Written schemes of examination (retrieved 19 October 2026)
- HSE: Pressure Systems Safety Regulations (retrieved 19 October 2026)
- CoolBlast: compressors for sandblasting (retrieved 19 October 2026)
- Sealey SB998 instructions (retrieved 19 October 2026)
- Kue Group: paint after grit blasting (retrieved 19 October 2026)