Hi Joe, you have me curious on your post, What is your pressure reading and is your rotary vane a high pressure model as 25 ft can be of concern for a lot of vane type pumps. If it states .69 bar or 10 psi on the pump decal and your guage is at or over 10 psi consider moving the 25 ft stone to 18 ft or so to prolong pump life, Good Luck Ted
