Spa Marvel Filter Cleaner 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 capfuls of Spa Marvel Filter Cleaner to upto 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 odours are a result of contaminants that have accumulated in the spa's filter. Using Spa Marvel Filter Cleaner on a regualr basis will help avoid odour problems. Spa Marvel Filter Cleaner Item will ship USPS 2-3 Day Priority Mail