NOTE: The system can also be attached directly to other existing filtration systems with 1.50" connections, or by using an adapter for 1.25" connections. Connect this Sand system inline, after the pump, through the sand filter, and attach the sand filter hose back onto the return fitting. If the Sand Filter is attached through these systems there is no need to run the original SFS or SFX pump. The Sand filtration pump will run through the system hoses when in use. Click here for instruction on connecting an SFX system to the Sand System or RX System.