My 2nd season of owning a pool and learned a lot from this sight. I have been using test strips that said my CYA was very low. Now I realize that the trichlor 3in tablets and shock add 0.6 parts for every part chlorine added. I'm sure my CYA was very high and last week I added a bunch of trichlor to shock with no effect. Time to dump my green pool. My question is, I still have some trichlor tablets and shock left, and want to use them up when I refill the pool, near as I can tell, I should use no more than 15 lbs of tablets or shock to reach 40ppm CYA? OR do I have the math wrong? How much Trichlor can I add before exceeding 40ppm for a 25kgal pool? I will switch over to either liquid bleach or the calcium based stuff in the future. I also have a leak somewhere that drops the pool 2 inches in 3 days, but have isolated it to the plumbing. That has helped delay my CYA build up problems. I live in SC with lots of sun and lots of tall trees with pollen next to the pool (crape myrtles are in full bloom).
Funny how the makers of Trichlor do not mention their product is already stabilized......
Funny how the makers of Trichlor do not mention their product is already stabilized......