- Apr 5, 2009
- 232
I bought a new filter to replace my 13 year old cartridge. I’d say I got my moneys worth out of it but it’s time. My water is clear but I’m getting dark green spots on the plaster so I think I need to shock the pool. Should I shock first let it clear up and then put the new filter in? Or should I do it the other way around? Thanks.