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  1. M

    Mustard Algae with high CYA...Need Advice

    Hello, I need some advice. Draining and re-filling is not an option. My mother-in-law has an issue with her pool and yellow algae growing on gunite walls. With a CYA of 70 and mustard algae present, should I SLAM the pool first(Recommended shock level is about 39!) or should I lower the CYA...
  2. M

    DE Filter Pressure Down From 11 to 6 psi

    Hello all, I am hoping someone can help me figure out why my DE filter pressure has fallen from 11 psi to 6 psi this week. I have not backwashed yet since opening and I would have expected a higher pressure. I have a 20K gallon gunite pool with Hayward pump and one return line leaving the...
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