I ran out of the purple filter cleaner that I usually buy from my dealer, so I decided to use a TPS solution to soak my filters. I rinsed them well (but obvioulsy not well enough).
Then I like to soak them briefly in bromine so that they don't get a musty smell as they dry. It always takes them a long time to dry!! :-/
I guess I either didn't measure well (because I thought I had a really really dilute TSP solution) or I didn't rinse well enough..but obviously I didn't do something right. My pH dropped like a rock when I put the filters in...and I am having a hard time getting it to stay where it belongs. To top that, I have an overload of bromine which must be from a residual in my filters!
:-/
Dumb dumb dumb