Chlorine tablets really seem to kill the pH. I need to remember this before I prepare the water for a cycle when I will use them - think I need to keep it a tad alkaline. Don’t really have a choice when back in work, I usually forget to put the chlorine granules in, which ends up being worse. On the plus side, the water vacuum did a great job getting every last drop out, making the refill much cleaner. Slowly getting the hang of this gig.