Thank you. I guess I will jsut use the cartridge they gave me for this year and next year just leave the unit empty.

Thanks again and btw I did read the long thread in the other topic area about this. Seems like it dies nothing lol. The pool guy today told me that it acts like a "brita" filter and makes the water absolutely pure as it passes through the housing. He even told me it takes metal out of the water. LOL.

John