Spa Marvel Filter Cleaner is a powerful cleaner designed to remove oils, hair, dirt and grime that gets trapped in the fabric of cartridge filters without the use of bleach or harsh acids. Simply remove filter from spa and rinse with a spray hose. Add two cap fulls of Spa Marvel Filter Cleaner to up to 20 liters of fresh water in a pail. Soak filter overnight in the solution. Rinse filter thoroughly with fresh water. Ideally the filter should be allowed to dry before replacing. Most odors are a result of contaminants that have accumulated in the spa's filter. Using Spa Marvel Filter Cleaner on a regular basis will help avoid odor problems.
This is by far the best cartridge cleaner I found in all the years I've been using them and with my hot tubs it works better than any product on the market last longer and you get more for your buck