Profile: Mer-Made Filter, Inc offers standard and custom-made commercial filtration systems and products. Our rugged fiberglass tanks are a breakthrough in filter manufacture. FRP basket strainers are designed & engineered for commercial systems. Modulating or float valves are used in surge tanks or vacuum D.E. filter tanks. We provide concentric or eccentric reducers that are used to properly reduce into and out of circulating pumps. Surge tanks are generally required on gutter pools to allow a storage space for water displaced by swimmers.