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Thanks. The new test kit is on order. How do I know if it is mustard algae and therefore requires the higher chlorine level?

Hi. My water is clear but I have what looks like algae staining the bottom of my pool. Please see attached photo. Since my water is clear, do you recommend a complete SLAM or is there another alternative? And if I do SLAM it, what is the max Cl level that is considered safe for swimming...

Thanks for the help!! The pool is a little clearer this morning, but still pretty foggy. To answer your questions, yes, I meant 2013 and the yes the pool is gunite. For the CYA measures, I approximated based on where the bottom of the meniscus hit the scale. (I find the CYA to be difficult...

My pH dropped from 7.6 to 7.0 over the last 6 days so I decided to add some EZ-CLOR pH UP to get back to an appropriate level. When I added the sodium carbonate, the water turned milky white almost immediately and has remained that way for the last 8 hours. Any and all suggestions on how to...