Best Pool Chemicals & Testing UK (2026) — Page 4
Chlorine, pH balancers and water testing kits.
Read our full Best Pool Chemicals & Testing UK (2026) guide.
#19 Pick
Clearwater pH Plus Increaser for Hot Tub, Spa & Pool, Granules 1kgRated 4.6 out of 5 stars (7,894)
£12.12
Pros
- Raises low pH quickly so sanitisers keep working effectively
- Granule form dissolves fast without clouding the water for long
- Pairs well with Clearwater test strips for dosing accuracy
Cons
- Overdosing raises pH too high, so add gradually and retest
£17.95
Pros
- Simple dip-and-compare kit for chlorine and pH readings
- Compact size stores easily in a pool accessories box
- Straightforward for first-time pool owners to use
Cons
- Very low review count so far, and stock is limited
£33.25
Pros
- Large 200g slow-dissolving tablets reduce how often you need to top up the feeder
- 5kg tub gives a full season of chlorination for most family pools
- Multifunction formula also helps control algae and clarify water
Cons
- Large tablet size is better suited to skimmers/feeders than small floaters