Hi. Algaecide isn't going to take care of your algae. Chlorine, brushing, vacuuming, and patience will. The Polyquat 60% is used for maintenance only by those people who choose to use it, (I don't), or when closing the pool for the season.

Take your FC up to shock level for your CYA and keep it there until the water is clear, your CC is <0.5, and you lose no more than 1ppm FC overnight. (Ask for more info if that doesn't ring a bell).

What does Nature2 (UNCHANGED) mean? Is there still a cartridge in there?