No, a clarifier does not lower pH. Some clarifiers actually increase the pH levels, which need to be kept within the desired range of 7.2 - 7.6.
The clarifier works to clear mild cloudy pool water. In circumstances where you cannot see the bottom of the pool floor, you may need to use a flocculant.
For a clarifier to take full effect, it can take up to 2-3 days and you need to ensure your pool is balanced and the filtration is running at least [...]
During the swimming season, you should add a weekly dose of Hyclor’s pool clarifier to your pool and monthly during the winter season.
Pool clarifiers bind fine particles together so they can be captured in the pool filter, restoring the pool water to its sparkling best.