The Hexeal Pool pH Plus helps you to keep your pool pH at the optimum level. The reason it is so important to maintain the correct pH is that water that is low in pH (acidic) can be corrosive to pool pumps, heat exchangers and damage the pool lining. The pH plus is a powdered additive that can be used to raise the pH to a desirable level. In contrast, if the pH is too high the effectiveness of all chlorine sanitisers starts to decrease. A pH imbalance can also contribute to skin and eye irritation, which you clearly want to avoid. We recommend that you always aim for a pH level of between 7.2 and 7.6. pH plus is suitable for use in swimming pools, spas or hot tubs. pH Plus / increaser can be added directly to the pool water to increase the pH to a desirable level.