Reservoir float valve with cycled system?
So I am setting up my greenhouse reservoir (bato buckets, tomatoes) and have a 150 gallon reservoir I am putting below ground level. Ideally, I would like to install a float valve to top off when the water level drops. However, I would not want to add water unless it dropped below a level that was only hit when watering. When the timer cycled off, the float would be under water. Is this bad? Float apt to failure? Putting the valve at the top would add water when I was watering...not good when the water drains back in...might overflow. Suggestions? Thanks in advance.