Replacement Spa Water Filters ® is the registered trademark of Replacement Spa Water Filters, the manufacturer of Replacement Spa Water Filters ® brand water treatment equipment. The replacement filters and ro membranes listed above are not manufactured or endorsed by Replacement Spa Water Filters. Rather, these filters and reverse osmosis membranes are manufactured by other companies. While these filters and membranes are compatible for use in Replacement Spa Water Filters ® brand water treatment equipment, we make no representation as to whether using these filters and membranes is consistent with the warranty applicable to Replacement Spa Water Filters ® equipment.