Hot Tub Serum Total Maintenance Water CareThe Hot Tub Serum Total Maintenance Water Care is a unique hot tub and jetted tub plumbing cleaner and biofilm prevention product. This will not fix a biofilm sick spa, but it will ensure that it does not get sick again when added to a regular maintenance routine. Biofilm is a bacterial sludge that all hot tubs can suffer from, and it is very hard to get rid of. A biofilm issue is especially difficult to remove when it is in the plumbing as it will