If you haven't purchased yet- go with the Pooltrine 60, always make sure the ingredients on your algaecide are 60% poly... something (has a big long name, but always starts with poly). The brand doesn't matter as long as it's ingredients are 60% poly...!!

Right now they don't offer the Pooltrine, but I just ordered the algae control in the gallon for $46.49. It is listed in my catalog for $20 off with free shipping and handling. This comes to $11.62 a quart -- cheap!! Last year I purchased the Pooltrine 60 for $7.73 which was really cheap.

Goodluck with your pool.