Other threads have asked this question in the past over the years although they have sometimes been defocused by multiple questions, and I have not seen a clear conclusion or satisfactory answer, so I'm raising it again.
Do people have a way of ensuring that their pump does not run dry? Specifically, what I'm thinking of is a way to make the pump automatically turn off if it starts running dry (for more than say 20 seconds), or an equivalent solution. This seems like it would be a common desire and mechanism, but I have been unable to find a good solution. (Specifically, something that requires a multi-hundred dollar flow sensor is not particularly desirable due to cost. However, I am still interested in such solutions if they are the best option that exists.)
I have a Hayward SP3202VSP TriStar variable speed pump. Thanks.