Orb-3® M411-000-5G 5 Gal Bottle Pool Enzymes Pro. Pool Enzymes eliminate scum and water lines, keep filters cleaner longer, and support optimal water balance without polluting your pool with harmful chemicals. These organics make pool water appear cloudy, supply nutrients for algae and mold, and they make sanitizers less effective. Orb-3 Pool Enzymes help stabilize pH levels, avoid water upsets, slow the growth of slime and algae, and are effective on scum lines.