AquaFinesse SwimSpa Tablets - 20 Count Will dramatically cut sanitizer use, aid in better balanced water, aid in softer water, keep pool surfaces & equipment cleaner and lessen overall pool maintenance Biofilms are the source of most pool water quality problems since 99% of pool bacteria resides in the biofilm By removing pool biofilms, you eliminate the areas where so many problems start - in the pipes, plumbing lines & filtration system Eco-friendly - AquaFinesse Swim SpaCare Tablets contain no harsh chemicals Continuous removal of biofilms lessens the need for draining & refilling