Jack's Magic The Sapphire Stuff feeder mounting base and biguanide—so you can swim

and biguanide—so you can swim sooner without upsetting your chemistry

90‑day algae protection — provides continuous algae prevention for three months when your chemistry is balanced

it restores surfaces to their original brightness with minimal scrubbing

and fiberglass

Weather shield blocks rain and debris

Jack's Magic The Sapphire Stuff feeder mounting base and biguanide—so you can swimJack's Magic The Sapphire Stuff is a great choice for any pool owner looking to prevent scale, staining, scum lines and foaming while getting crystal clear water quality. Its powerful 4 in 1 liquid formula combines a clarifier, flocculent, chelating agent and sequestrant to quickly group together microscopic contaminants into large enough particles to be trapped the pool filter, while being much easier to apply than granular alternatives. Best of all,