this is not a helpful answer, but I know people that have had a broken speedometer on a car and did fine since you mentioned.
The reason I asked the question is that the prior homeowner told us (NEW TO POOL OWNERSHIP) that he didn't use it, he just gauged the strength of flow by hand, when it wasn't feeling like it normally does, he would back wash and rinse.
The reason I asked the question is that the prior homeowner told us (NEW TO POOL OWNERSHIP) that he didn't use it, he just gauged the strength of flow by hand, when it wasn't feeling like it normally does, he would back wash and rinse.
This is a bit like asking if a speedometer is necessity on a car