Check the listing for details. Spa Marvel Filter Cleaner (8 oz). Condition: New. Listed at 29.99 USD. Spa Marvel Filter Cleaner (8 oz) Spa Marvel Filter Cleaner - 8ozSpa 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 capfuls of Spa Marvel Filter Cleaner to up to 5 gallons 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 Made in the USA! Returns are not accepted on opened or used products and are subject to a 10% restocking fee. If you have any questions, please contact Clearview Fireplace and Patio. We would be happy to help!