After 20 years of owning my pool and encountering many problems I am now just learning about pool chemistry through this site. I ordered and received a TF-100 test kit and love it.
While waiting for the TF-100 to arrive I noticed that the top step of my pool ladder had turned pink. I also saw a little pink on the rubber feet of the ladder. When I poured liquid chlorine directly on the top step the pink immediately disappeared, telling me it was probably organic! I pulled the ladder out of the pool and the underside was much worse. I cleaned the ladder with bleach and a brush and put it back in the pool. The pink does not appear to be anywhere else in the pool.
I now maintain my FC between 5–10 ppm based on my CYA being 60+ ppm. I seem to be losing 4 ppm over a 24 hr period the three times I’ve checked it. I’ve checked the FC loss overnight twice. The first time it was 1 ppm but last night I lost 2.5 ppm. My CC level has maintained at < 0.5.
I have not yet shocked my pool this summer, because of our short swimming season I hesitate to lose good swimming days to shocking the pool. I am still a little confused about chlorine loss/consumption. I read in “pool school” to expect to lose 2-3 ppm daily and that there should be 0-1 ppm loss overnight.
My pool water currently looks excellent.
I’m not sure if the 0-1 ppm overnight loss only applies when you are shocking the pool or also when just maintaining normal levels?
Given the amount of chlorine loss daily and overnight, do you think I still have a pink slime problem and should shock the pool?
Shouldn’t my CC be higher if I have a problem?
Am I just paranoid?