After slamming my pool and finally getting it clear I am left with dead algae on the bottom. I have always had a sand filter and my new home has cartridge. When I try to vacuum using a conventional hose attached to the skimmer I start out at about 10-15psi and some suction but within minutes my filter clogs up and my psi shoots up to 30+ and I lose suction. I have repeatedly switched out filters and am constantly cleaning them but unable to vacuum up the algae. All it does is stirs it up clouding my pool again. I have tried using my Polaris using a sand/silt bag with and without a filter sock but the algae goes right through the bag. By brushing it is little by little filtering out but requires multiple cleaning and filter changes per day. I have a Hayward C1200 filter with about a 10,000 gallon pool. There is no way to vacuum to waste like there is with a sand filter. Is there something I am missing or is this all I can do? Thank you!