Curious as to the definition of organic contaminants. I had a problem with my old plaster and yellow algae, we'd shock the pool, it would clear, then be back. I think our problem was high CYA since it had been 15 years since the pool was partially drained, but that's just a guess because I entrusted my pool with a pool service.
All that being said, the pool guy said the reason I had yellow algae was because I had a couple of flowering plants close to the pool water.
Now that I'm starting with brand new plaster, I want to know if flowering plants would be considered an organic contaminant.
Thank you kindly for your time!