Not yet, we have built a GHL demo system in our home for such purposes but first I must get the system stable and stop adding parts

The most effective way of stopping return pump back drain is to use a non return valve, having said that mine split in half due to the 5 meters of vertical back pressure, showering my basement with oceans finest water!

An official GHL software manual only for these important features would be the best option as it can be changed when firmware gets updates. But until then at some point this year I will do a manual, but it wont be soon.