I ment only this spring it does not get clear. In the 20 years that I lived here they always drained the pool completly and started with fresh city water. This year we wanted to see if we can turn it from swamp to clear for the first time. After I have spent endless hours working on this (approx. 2 per day) I will not do it this way ever again. The electricity to run the pool 24/7 cost the same as new clean water. All the chemicals I have used so far are mentioned in #4! No I am starting with the DE.