Hello again,

As metioned in a previous post, I substituted a 20 gallon pressure tank for a 120 gallon tank in my irrigation system.
This changed the frequent cycling of the pump from every 20 secs to every 7 minutes or so....all was well.
Suddenly this morning the pump has strated cycling every 10-15 secs again...lots of water in the well....the tank pressure guage drops from 50 to 30 in about 10-15 seconds, and dodes not seem to hold.
I've not touched the system at all......any ideas as to what might be causing this? If I've become waterlogged, what causes this and how do i prevent this in the future?