I have been around numerous topics here and as usual, have received so much awesome information. I admit though that I am about to take the easy way by starting a new topic as the various posts I am reading are not getting the direct answer I was looking for. Sooooo, I apologise if this topic has been covered before.
I don't treat phosphate as I learned here to kill the algae and not worry about it. However, 2 pool stores have told me high phosphate can hold on to, or interrupt FC. Is that accurate?
MY CYA is high at about 100. FC has been holding around 20 for days despite hot and direct sun. Although not recommended, a CYA of 100 should have target FC of 12. I am at 20ish and water is clear but algae is just staring to form on one seam. I shocked a week ago to get rid of some algae and that is how FC got so high. I realise I may not have had the FC high enough for long enough to rid all the algae, but it has held high for days now and yet algae is starting again. I realise the CYA is high but my levels of FC should still work no?
Is it high phosphate that could be interfering with the FC to keep the algae at bay????