FC requirements in colder weather


Well-known member
Jul 4, 2019
Scottsdale, AZ
This summer was the first for me using the TFP methods. My CYA being 50, I kept my FC 6-8 as recommended and never had an algae problem. It's getting colder now in Arizona. Since algae has less tendency to flourish in cooler water, I'm wondering if I can let my FC levels drop a bit to the 3-5 range?