I am going through a transition of sand filter to cartriage filter. I have a couple of questions. If I can clearly see the bottom of my pool and there is alot of algea sitting on the bottom should I just go in and try to vacuum that out or should I try throwing some chemicals in there to kill the algea first? This is of course my first time vaccuming with a cartriage filter and I am not to sure how to do it. Any tips?? I was so use to the vaccuming to waste and backwashing and with this cartriage filter I don't. At this point I am filling the pool up and the only thing I have put in there is 3" tablets and some Dichlor (sorry can't spell) I sure don't have alot of money for chemicals since this filter cost 323.00 today plus all the plumbing to hard pipe everthing over again .