HELP - Filter draining during the night • Pumping Station ...

I am troubleshooting a problem that ocurred after I replaced the filter, heater and had to replumb. I have solar. When the solar 3-way valve turns of for the night, it looks like in addition to the solar panels draining as they should, my filter is draining back into the pool overnight. In working with the Autopilot people, they think that with my current plumbing (see the second picture here If you look at the second picture, the output of the filter goes to the check valve and from there goes to the 3-way valve. When the solar 3-way valve closes at night, the panels drain (as they should), but because of the 3-way, allowing draining the panels, the water from the check valve empties, no longer offering resistance to stop the water from the filter to drain. They are suggesting that the output of the check valve to the 3-way solar valve should go up so that the 3-way solar valve is much higher than the check valve leaving the check valve with water in it to keep the flapper close through water pressure instead of allowing slow air leaks. Right now the multiport valve (filter) is level with the checkvalve and the 3-way valve, and with the solar side closed there is nothing to stop the filter from draining through the return. I can watch the check valve emptying. The path goes from the open side of the 3-way to the Mastertemp heater and out to the returns. Does this make sense? Thanks. It is a 3-way Jandy. According to Pentair and Pool Pilot, even with the spring, if the check valve has no water to exert some additional pressure, it is not totally airtight and air will get in. Water pressure helps keeping it shut (according to them). Their suggestion is to raise the 3-way valve connected to the output of the check valve about a foot. That would keep the water level in the filter at the same level of the Jandy 3-way valve (two colums of water equalize). That is their reazoning as to why the filter is draining out to the 3-way valve level. Does it make sense? Do I need to worry about heights of valves, etc? Actually, if you look at the picture, you will see that the plumbing from the filter output goes to the check valve, from the check valve to the 3-way. When the 3-way is in the non-solar position, the filter output has unrestricted flow path to the pool return, so what Pentair is saying is that the filter water level will find its level which will be the hight of the filter multiport valve (same hight of the check valve and 3-way).

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