Simple question that you should be able to answer to support your position; since he doesn't have an expansion tank now, and as yet we don't know that he "has a lot of PEX" tubing that with his well water system pressure is expanding/contracting as you guess, and the Clack turbine doesn't like to run backwards, how do you see him getting non constant backflow totaling some 800 gallons per day as he has said he is seeing or has calculated?
BTW, all valve meters have a percentage of error and thereby don't register very small flows.
I haven't looked up the Fleck metering specs but I disagree with you about Clack being the most sensitive because I think I recall Fleck metering being a bit better than +/-5% and no less than a 1/4 gpm.
Here is the Clack WS-1 specs: (+/-5% and no less than a 1/4 gpm)
Accuracy... ± 5%
Flow Rate Range... 0.25 – 27 gpm
Gallon Range... 20 – 50,000 gallons
Totalizer... 1000 - 9,999,000 gallons
Exactly where in the overall system is the "dump" line from the geo conected?
The meter being sensitive is not the same as a meter specification. The design and the way it senses water. Go to a meter training seminar and get back with us afterwards to discuss.
That is why an electronic softener can be plumbed in backwards for years without anyone noticing. The majority of electronic meters are not senitive to a water flows direction, just flow. The mechanical meters (5600 Econominder) will not work when plumbed in backwards. Not sure where he is going with this other than to try to bring up his post count.
800 gal/day at .5 gpm = 30 gal/hour for 26.67 hrs.
Now that is a constant flow for 3 hrs longer than a day and I doubt the geo system is running constantly 24/7. I don't see that happening as some of you do.
I say there is probably a much higher than .5 gpm flow for a shorter period of time and it isn't caused by expansion backflow of only PEX tubing (that he may not have like he doesn't have an expansion tank).
Now I may be wrong but I say there is probably another cause and the check valve solution that y'all have come up with isn't the cure.
I will try and get pics up, but have been extremely busy with work and with moving into the new house and getting it prepped. I am currently at work now so I can't post pics but will try to write more specifics.
Water line comes in and goes to the pressure tank. There are 3 3/4 water lines that come off the pressure tank line. One is a spigot, 1 goes to the water softener and the 3rd one goes to the geothermal unit. Besides on/off valves, and the taco valve that is right before the inlet of the geo thermal, there isn't anything else.
There is no thermal expansion tank.
Most of my plumbing is PVC, but the new stuff that the plumbers put in is PEX.
If the Geo is off, the meter on the clack does not register any gallons of soft water use. The only time it does is when the Geo is on, or, If i open a valve at the storage tank and dump water into the sump pump pit. This will also cause usage to show up on the clack.
If I turn the inlet to the water softner on bypass, or turn the valve off to the softener, while the geo is on, no water usuage is measured on the clack.
While geo is running, the cycle time of my water pump is about 30 seconds. about 13 seconds to discharge and about 17 seconds to charge while geo is running.
I went from 992 gallons left to recharge, down to 770 gallons, from 5am to 12 pm. The temp was high 30's to low 40's. I have a 3 ton and approximately 2700 sq ft(including the unfinished basement) home. The unit is not running constantly, but it does run a lot.