My husband was trying to clean up a really bad algae problem in our pool and he purchased Sink & Sweep based on information that he found on the internet. The algae coagulated and sunk to the bottom as it was supposed to, but when he started to sweep it up, he found that it was just blowing back out. After looking at the bottle, he found that it states NOT to use it on pools with a cartridge filter. There is no information about this on the Aqua Chem site. The algae is not sticking to the filter at all. What should we do at this point?