It works wonderfully. Only complaint is it collapses easily and has no rigid bottom.

These are great to have when replacing my filter every 3 months. They look just like the name brand ones and fit into my slot as expected.

Instructions with the sticks describe exactly how to sanitize a spa with no chlorine nor bromine. This after the initial super-chlorination of a new fill with a tablespoon of dichlor and to activate these mineral ball sticks. After the initial dichlor...  Read More

Contains bacteria that is not safe. Instructions give clear directions for chlorine spas but no mention at all for bromine.