We are on a well with a submersible pump and bladder tank. Our pressure is set to 20/40. A few days ago I noticed the pump was short cycling, ie would run about 5-10 secs, shut off for 5-10 secs and then repeat. I checked the bladder tank and it had no air in it so I recharged it. I listened today to see how much it was cycling. I was filling the washing machine and the pump would run about 20 secs, shut off for about 40 secs and then run again for about 20 secs. From what I've read the pump should be running for closer to a minute. Unfortunately my water pressure gauge is broken so I can't verify the pressures the pump is turning on/off at. What should I be looking for/checking?

Our home is fed by a 25 year old 450 feet deep well. Recently we occasionally get water spurting out of the toilets and faucets. It seems like there is air trapped in the pipes. Once in a while the breaker for the pump trips and needs to be reset when this happens. We do have a controller to shut off the pump if there is low water and the motor is spinning too fast. Our plumber does not think that is the cause for this problem. We did add a whole house filter to the system about 8 months ago. I do not know if this the cause.