Hi I am new here but have reading through topics and pool school for a few weeks now and I am having a hard time with my pool now. We just bought a house with a pool and it was awesome for the first month and a half and now we are having constant problems with algae. I'm pretty sure I know what to do after all my reading but wanted some reassurance. The CYA levels in the pool are just over 100(I tested a few weeks ago and it was 100 but since have added some powdered shock so it's probably a little higher I would think). I let the FC levels get too low "0" at some point several weeks ago, bought some powdered shock and added it. The FC levels have been low since. 2 weeks ago I noticed the water wasn't very clear. I added like 2 gallons of bleach cause the chlorine was low again.(I only had test strips at the time) When I took it to Leslie's the woman told me everything was fine but CYA was really high(which I already knew) and she advised me to drain part of the pool and to change the sand in the filter since it had been at least 5 years since the sand was replaced. So here's what I am planning on doing:
1. Draining the pool about halfway to get CYA down and then re-shocking it until it's clear
2. getting the sand replaced on Friday
Once these 2 things are done I can better keep track of FC levels and be saving a lot on chlorine.
I was wondering if I should go ahead and drain the whole pool and start over, or just do what I had planned on doing in the first place. This is my dilemma. Any advice would be greatly appreciated.
Oh and the green only showed up after we were gone for 3 days and not keeping up chlorine and filtering 24/7 like I had been doing. I don't think we ever got rid of the algae in the first place :/