Thank you @Lil Dab no need to apologize I appreciate any help I receive, the consensus is a bigger pump would be beneficial. I am running an open system no inserts or emmiters, all tubing same exact length. I assumed Flora Flex was on top of game since they sell this pump for an 8 plant kit and I am only running 4 atm. System is running fine atm without the filter, will replace pump at the end of this run. May need a 4 horse sump pump to feed these 4 plants with MC@SNOOKY Sorry I didn't answer your actual question I got side tracked on the pump. A filter is necessary if you have something inline the system that can plug up the ie: emitters or flora flex bubbler manilfold with the emitter puck in. If your running open flow and have nothing with small orifice's that can clog then you can probably get away with no filter. The big problem comes with the emitters and running organic's in the Rez stuff gets plugged late grow