DIY dual float switch top off

[Luigi]

The reason of the 2 switches is that with the single switch the solenoid of the RO would go crazy (on/Off) many times a day,
yes it will maintain the water at constant level but.. Definitely shortening the life of it,
So with 2 you can decide how much the water has to evaporates before turning on
So what we need?
# 12V power supply
# an extension cord to be cut
# 12V Coil Power Relay 5A 2DPT 8 pin
# case or housing .....me I used my Kids snack container .
The distance between the two is about 3/4" horizontal and they are offset about 1/2" vertical,
So when the water is on it has to fill the 1/2 " sump before the second switch turns it off