My manual does not specify to whether I should close the drain and keep the faucets closed after filling with antifreeze. I pumped antifreeze and opened both hot and cold faucets on sink and outdoor shower (with drained hot water tank bypassed) until antifreeze came out. I then closed the faucets and then turned the pump off. My manual said to add 2 more cups of antifreeze down the drain. Before I did, I screwed a cap onto the outlet part of the drain on the outside of my pup before I poured 2 cups down the sink. So now all lines including the drain are completely filled with antifreeze. I'm worried that if there's still water anywhere at all I may have a problem as they'res no room for expansion at all with my closed valves and blocked drain. I've read that only p traps and the pump itself etc need to have antifreeze and that it appears some people keep their faucets open? Should I open my faucets (which would empty some antifreeze but apparently keep some where essential) and remove the cap from my drain (I've capped it where one would normally hook up a hose to a grey water bin to collect grey water). Also, do I need to remove the hot water heater anode? By the way, I'm in a climate that freezes all winter.