Hi Chris,
There's no problem with that. Lots of people pull back the cover to add algecide or chlorine.
Do you have a submersible pump? I have one with a long output hose and I used it this season to circulate chemicals. The hose moves around the pool and works quite well.
The chemicals might work their way around the pool naturally but I'd feel better if I could circulate them somehow.
Lenny
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