I have a pressurized loop that leaks about a cup of fluid a month. I usually add water to the loop about every two months through the PT ports with a needle. I am getting tired of doing this, and have found a product made by Geo-Flo Products called the GEO-Booster. Basically, it has a 1 gallon holding tank and a small motor that will inject fluid in the loop as needed to maintain 35 PSI of loop pressure. It looks like a wonderful fix for the small leak in the loop short of going to a non-pressurized flow center for about $1000. The GEO-Booster sells for close to $375. I am trying to do find more information before I have the GEO-Booster installed and would like to hear any advice or experience that anyone has with this product. Another question I have, does the efficiency of the unit go down as pressure drops in the loop?