A washer hose is the hose that takes the dirty water from your washing machine to the sink or drain. How I hooked the PVC was get about2' of 1/2" tubing then you would hook that to the 1/2" outlet on the pump, next you would get a 1/2" connector that will attach the hose to the PVC pipe , then just build the PVC pipe to the main tank. Drill about a 1/16" hole right below the water line in the tank so when/if the pump stops working it will break the seal alot sooner. If you need I will take picks of mine and add them in the DIY. To perform maintence on the filter is easy turn the pump off. the water will rush back to the sump tank, but only till it reach's the 1/16" hole you drilled in the PVC pipe. That is also why you need to leave room in the sump so it won't over flow.