Attach the other 3-inch piece of hose to the "Out" spout on the hose valve, and secure it with a hose nut. Attach two suctions cups to the spray bar. Place the spray bar in the tank, and fix it to the side with the. Attach the spray bar to the rim connector nearest the exhaust hose, and plug the other end with the end cap. Open the valves all the way to pull air into the exhaust hose. If you have lost or did not get an instruction manual when you bought a Hagen product, you can download one from here. Fluval 203 Multi Filter 420 Liters per Hour (111 gph). Fluval 303 Multi Filter 840 Liters per Hour (222 gph). Fluval 403 Multi Filter 1200 Liters per Hour (317 gph). This service is free and it's fast and easy to. The FLUVAL filter is designed to run in small to mid-size aquariums and offers mechanical filtration of the environment. The installation of. Identified by a light imprint of Fluval on the front side of the casing and a 306 sticker on the front. Any leaks or holes will cause the filter to slow down or stop pumping water. Pinprick holes or holes that cannot. 22,209. Free Manuals. 86,672. Typically, media is placed in order of the size of particles it filters out. Media that removes large particles should be the first filtration and biological filters will be the last filtration. Reattach the holders to one another and place them inside the case. Hagen Fluval Canister Filter Replacment Parts: Impellers, impeller shafts, impeller. Useful Links: Fluval User Manual Fluval 104/204/ 304/404. Attach a hose lock nut over the hose on each spout to secure the hose. Insert a hose valve into the end of each long hose. Attach a hose nut over the hose and valve to secure the hose.