After speaking with Jim about the cinuintong problem with my positive for total coliforms, it was decided that the 5 stage RO system was best for my drinking water.  This was chosen as my cold water at the kitchen sink bypasses the water softener.  I already had a whole house UV system to treat the water after it comes thru the water softener and I also had my drinking water at the kitchen sink run thru a ceramic filter.  The ceramic filter was effective in removing the total coilforms, but it had other short comings that the RO system addresses.I was were impressed with the quality and ease of installation of the .  As per Jim's recommendations, I also installed a calcite filter to improve the taste of the drinking water and so far I am pleased with the taste of the RO water as I had tasted other RO water and it did not taste as good.I would highly recommend Jim as his expertise in drinking water and its treatment is head and shoulders above all the other so called experts I have spoken with in the past few years.  Also, Jim will not try to sell you equiptment that you do not need.Respectfully,Mark