Aqua2use Gray Water Replacement Filters Aqua2Use filters are made to be taken out and hosed periodically, good maintainence being once every 2 months. After a year or two, depending on filter usage, you will want to replace with new ones. Simply remove the old filters and install the new ones in your unit. Complete set of 6 Matala filters takes less than 5 minutes to change out. Buy today to have a set on hand and save 5% -- plus you save on shipping later!