I've used Micron CSC up here in the Northeast with good results. Last year, I went to West Marine's CPP because I was told it is the same stuff but made for West Marine and is sold at a significantly lower price. (Something like $169 v. 119/gallon.) I don't know if it really is the same stuff, but I had clean bottom at last year's haul out and will go forward with the West Marine product.