Phosphates are basically algea food.
Using BBB, we tend to not worry about phosphates, because we maintain adequate chlorine levels so that the algea never gets started in the first place.
So... about once a month or so, I take my water into the pool store to get tested. I don't really care what their numbers or recomendations are. I just like the print out that I usually get that says: "Congratulations! Your pool is perfectly balanced". If anyone looks at me funny for using BBB, I take out the print out and say: "Pool store doesn't seem to have a problem with it."
Every now and then when the pool store is not too busy, they test my phosphates and say: "Although the computer says you are perfectly balanced (here's your print out btw), your phosphate numbers are off the chart... you better buy some stuff from us."
I have gotten quite adept at deflecting this. No worries.
My winter closing procedure has pretty much been to turn off the filter and watch in wonderment as my sparkling oasis turns into an algea infested swamp.
I'm OK with this. Honestly I rather enjoy the epic battle waged with the algea each year as I am opening the pool. In fact, I am considering making myself a super hero costume, and composing some theme music... but... ummm... you don't need to know this... Nevermind.
Anyway... My question:
Might is be a good idea to dump some phosphate remover in the pool as part of my closing routine just to keep things in check?...
Perhaps my routine of letting the pool go to swamp is keeping things in check by itself: The pool gets infected with algea... The algea eats the phosphates... In the sprint I kill the algea... and everything is wonderful again.