CTX CTX-21 Alka 6kg reviews: 4.7/5 based on 13 analyzed reviews, updated September 5, 2026.
Praised: treatment effectiveness.
Review summary
Written by Augur from the 13 reviews analyzed
This product is an alkalinity increaser in powder form, designed to raise the total alkalinity (TA) of pool water. According to user feedback, it is particularly effective at stabilizing the water balance.
What buyers talk about most
+Strength : Treatment effectivenessThe product works perfectly, raising the overall alkalinity of the pool quickly and effectively.