HTH 67012 Super Clarifier， 1 quart<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>For crystal clear water， add hth super clarifier once a week</li><li>Use this product 4 to 12 hours after EACH shock treatment， super chlorination or algaecide treatment</li><li>Clarifies water Concentrated formula. Improves filter efficiency. Does not affect pH balance. Compatible with Salt systems</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41HqxTfNsrL.jpg" noproxy>