Hope everyone is well and ready for the swimming season!
I have a quick question: I've been doing the TFP system for a couple of years now. I just started SLAMing (used to be shocking) my pool Monday evening. Ran the pump for one hour and tested using FAS-DPD kit, CYA did not even register (considered it 0) and of course FC was zero. I added 4lbs of solid CYA and enough bleach to get to 15FC. What is weird is that the pool is not consuming FC at the rate I am used to... normally when I do this the FC goes back to 0 in the first hour and I have to use a ton of bleach to keep it at shock level. It is now almost 48 hours later and I have only used about ten 121oz bottles of bleach and the pool is still green, it even looks like algae is still growing on the steps? I bumped up the FC to 20ppm yesterday, but I only lost 5FC overnight. It feels like something is going on as this is taking longer than I am used to... also, pump is running fine and I have backwashed about three times when the pressure gets really high.. any thoughts?