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So my alk was low yesterday, 40ppm. Calculator said add 124 oz. by weight of baking soda which I added. This morning my alkalinity is 30. What can cause this? I never had an issue like this before. I mixed it in a bucket and added it in front of the return jet like I always do. Other...

My concrete deck is in need of cleaning, visible mildew? What chemicals can I use that won't mess up the water if it gets introduced during the cleaning process? Thanks for any advice!

I have been using zeosand for about 4 years. This year I am getting green sediment on the floor of the pool. Initially thought it was pollen, then dirt, then zeosand from the filter but it was too small to be zeosand. It will vacuum up but it returns the next day. Vac to waste does the same...