Clearwater TA Plus Alkalinity Increaser for Swimming Pool and Spa Treatment, White, 19.0 cm*9.7 cm*9.7 cm
Reviewed 9 August 2026 · price checked live
Check price on Amazon →Overview
We track Clearwater TA Plus Alkalinity Increaser for Swimming Pool alongside 48 other pools, hot tubs & supplies products, comparing it on rating, how many people have rated it and what it currently costs. According to the listing: Increase the total alkalinity of your swimming pool or hot tub water and prevent it from becoming corrosive. Help control your water's alkalinity level, reduce the acidity level and maintain a correct PH. Those are the seller's own claims rather than our testing, so treat them as a starting point. On Amazon it holds 4.7 out of 5 from 3,407 ratings. What that score is worth next to its rivals is set out below.
- Brand
- Clearwater
- Amazon rating
- 4.7 / 5 from 3,407 ratings
- vs Pools, Hot Tubs & Supplies
- 0.2 above the category median of 4.5
- Rank in category
- 3 of 49 rated pools, hot tubs & supplies we track
- Price position
- Among the cheaper options (category spans £4.99 to £26.99)
- How proven
- Well established, above-average review volume
How it compares in Pools, Hot Tubs & Supplies
Across the 49 rated pools, hot tubs & supplies products we track, the typical score is 4.5 out of 5. This one sits at 4.7, which puts it in the upper quarter of the category rather than level with it. Where almost everything is rated well, the gap at the top is small in points and large in practice. That places it third of the 49 we rank here.
It carries 3,407 ratings against a category median of 1,068. That is enough of a base to take the score seriously without treating it as settled.
On price it sits in the lower third of a category running from £4.99 to £26.99, where the midpoint is about £14.99. Cheaper than most while rating at or above the category norm is the combination worth looking for, and it is the main argument for this one.
Worked out from the 49 pools, hot tubs & supplies products in our catalogue, not from the brand's own claims. How we rank →
Key features
- Increase the total alkalinity of your swimming pool or hot tub water and prevent it from becoming corrosive
- Help control your water's alkalinity level, reduce the acidity level and maintain a correct PH
- Water that's too acidic can cause chlorine treatment not too work effectively leading to pool/hot tub damage and irritation
- Recommend using the alkalinity increaser if your water drops below 7.2 on the pH scale or below 80mg/L alkalinity level
- Clearwater is a BISHTA approved member and recommended by brands such as Bestway and Lay-Z-Spa for reliable, safe and high-quality water treatment
