I purchased a home in Raleigh NC that has a 500' SCW that produces 25gpm and is used to supply household water and supports two 6 year old FHP geothermal units (5 ton ES-61 and 2 ton ES-24). The 5 ton unit is zoned to support a basement on one zone and the second zone on the main level. The 2 ton unit serves a small upstairs in a single zone. The system has two large bladder tanks and a Lakos TwistIIClean spindown filter on the geothermal input post bladder tank (that I installed to replace a standard spin down filter that was shot). The well is producing fine sediment that causes the filter to have to be flushed frequently (every 3 days) or the system loses pressure and craps out. Additionally this winter it has had freeze ups that can't be explained by sediment but that require that I put the system to A/C mode to unthaw the coils. I have had several different people look at the system and continually get conflicting information on how to fix the problem and have spent a bundle trying the things that were recommended to no avail. When I purchased the property the pump was located at 300' and the return line was above the surface of the static water line. The first attempt to fix the issue involved adding a sleeve to the pump and putting the return line down 20 feet below the static water line. This helped but did not fix the issue (filter could go for 7 days without being purged). The second attempt involved putting a camera down the well to see what was happening and they noted there was a strong water vein at 80 feet below the surface that they felt was contributing to the washing of the well. They recommended putting a plug into the well to separate that portion of the well but the geothermal contractor said that would ruin the performance of the well. They then suggested that we try moving the pump up to 160' and moving the return line to the bottom of the well with a u-bend on it to force the return water upward. They did that and removed the sleeve on the pump at the same time. This did not help. I have been looking at the LAKOS Sandmaster H20-20 with Accupurge as a possible solution to my sediment problems because going to Closed Loop costs so much more money that I can't afford right now. A few questions: 1. Any other ideas for how to fix this issue? 2. Would taking my household well off of this system help? 3. Any experience with the LAKOS Sandmaster as a solution? 4. Does anyone know what size particles I need to filter out to keep from injuring the Geothermal systems? Any help you could provide this Geochallenged Girl would be appreciated!