Quote Originally Posted by mmandley View Post
...Is it the mose Efficient? No
This is more because i agree with others, you need a 1 way check valve on the Vent line. I ran my reversables all summer last year and while yes they do drain pretty well with no check valve in the Vent, they drained a LOT better with a Check Valve in the vent.
I will add a check valve to the vent line and reverse my check valve symbols as I have them drawn 180 out



Also with a check valve in the Fill side you will limit the pump to how much water the check valve can pass threw.
This is my main concern



Also you have to be EXTREAMLY carefull to make sure you dont turn the Pump on for Drain with your Y valve in the FILL position or you will damage the pump, or blow a hose.
That isn't a valve, just a simple wye fitting


Just hoping the idea works and I will fix the schematic --- Eric