Hi everyone, I have a relay design problem which seems to have stumped the Jaycar people so i thought I would turn the the smartest community I know, OCAU!!! So I have a tank of water at waist height (on a table) which is connected to a tank sitting on the floor via PVC piping which has a gate valve halfway to control flow, to an extent. This constantly feeds into a bottom tank, which also has a tap at the bottom which goes to a water pump which pumps the water back to the top tank... which then flows back down to the bottom via PVC then up again. Now foolishly at the start I thought I could 'match' the water pumps flow using a gate valve on the PVC piping with some trial and error.... I could, but as soon as some water evaporates it'll be out, flooding or over draining the bottom tank. Sooo, I thought my solution was to buy a float switch, install it in the bottom tank to turn the water pump on once it hits over its desired water level, so that the pump and switch is de-activated until the water hits the float switch level and it would turn the pump on to keep it from overflowing. I went to Jaycar and one of the guys there designed me a relay because he advised me my plan to splice the float switch into the active or ground (to cut the power to the pump) was apparently a bad idea lol. There's a diagram of the relay below. It works, but it reaches a balance where the pump gets turned on for a second, then off for a second, then on for a second, off for a second etc etc. and it sounds like that pump will be fucked in no time or will drive me insane first. Sooo my second idea to that would be to add some part to the relay so that once the float switch turns the pump on, the pump stays on for a designated amount of time like 30 seconds or a minute, so it will drain more water than needed before it stops, giving the pump a rest while it refills. So I went back to Jaycar to find if there's a device to do so, I was told there is no easy or direct way to do so and they were kinda stumped how to do it at all, so he had me buy some arduino/raspberry pie type stuff and said to google how to use it and add that to the relay.... Seems a bit complicated and it seemed like he just wanted me out of his face at that point lol so I'm guessing it's not the best solution. Does anyone have any ideas to my problem?