Yeah. I'm afraid the country club pool I take care of has also been de-CYA'd. I wasn't paying attention like I should have been what with the wedding, and then the issues with my sister.

Anyhow, I haven't checked yet, to see if it went to ammonia. I hope not! But, I'm beginning to realize that we need to provide pool owners with a clearer plan to avoid algae AND bacteria over winter, so they can prevent the whole CYA to NH3 and the subsequent monster chlorine demand in spring. And, we need a clear answer to the "how can I tell" question.