Thank you pool doc!! Your the best.....

[FormerBromineUser]

Hi. Good to hear from you.

You have a long history. I use polyquat too, but only on closing. After I use it, I bring my FC back up to shock level.

Don't be a stranger!

[CarlD]

The polyquat certainly helps and it's been part of my closing routine for many years. But if you shock the pool thoroughly before you close, and open before the first algae bloom hits, you should be fine.

Meanwhile you CAN use a little polyquat weekly to inhibit algae, just 1 to 1.5 ounces. Polyquat can keep algae from starting if your FC goes too low briefly.