Did the PAINSOFT rep contact you by telemarketer or mailer or door knocker?
I am an EcoWater dealer and have a few friends who got "suckered into their sales pitch and they "do not work"!
I gotta say that $400 dollars is "HIGHWAY ROBBERY"! THEY MIGHT AS WELL SAID BEND OVER! A rainsoft saleman will tell a customer anything to get a sale! They probably charged you $4-$5k for a system with financing for like 72mo.
The best systems out there are only the best if they come with a service dept who doesnt try to "RAPE" their customers! I deliver my customers salt (well the smart and non-cheap) so when i come out i check the performance of their system and TEST the water in fromt of their FACE so they can see if it works!
I charge $89.95 for a service call plus parts! Sad thing is "You can only buy the parts your need from RAINSOFT!" they design their system to be "PROPRIETARY" meaning you have to pay their outragious prices!
I would call round different companies in your area and ask what they charge for a service call!
You definetly need a piston and seals and spacers inside the valve! The fleck 5600 is the same valve that rainsoft claims in a "GOLD SERIES".....but if im not mistaken......the seals and spacers are the same as a fleck 5600 but......and a big but......the piston is slightly different.....making it proprietary! Rainsoft doesnt want diyers trying to fix their own systems because it denies their dealers revenue!