Frustrated pool owner here...... (and fairly new to TFP)
I've been battling algae and it won't seem to get better. I took apart my filter (Quad DE 100) and cleaned it and recharged it a week or two ago and thought pool was good. But the algae is back. Mainly on the sides of the pool.
Should I lower CYA by replacing approx 45% of the pool water as TFP Pool Math suggest? I've not done that yet ( 2 year old pool) so I'm a bit leery.
Previous readings from TexSun said CYA was at least 151+ but after a hard rain they said it fell to 40. They said CYA sits in the top layer of the water and it drains out the overflow, and they suggested putting a hose at the bottom of the pool to push the CYA out of the overflow like a big rain would do. Not sure if I believe them or not, which caused me to get the TFT 100.