Advice on installing CSV in existing system

[GHG]

We draw water from a lake with 1/2 hp convertible single pipe jet pump to a pump house. The  30/50 pressure switch is attached to the pump and connected to it with a plastic (?) tube. An average sized (40 gallons maybe, it is not huge, not tiny) pressure tank is in the pumphouse with the pump and switch. Water is sent to the house about 75 feet away in a buried line, maybe 1 1/2 inch?

Because the water from the lake has a lot of sediment in the spring, summer and fall,  once at the residence the water is fed through a 20 inch, 25 micron bag filter, then a 20 inch 5 micron string wound filter and finally a UV purification light chamber. The pressure at the pump is 50 lbs but after passing through all the fittings, the pipe to the house and the first bag filter the pressure is only 38lbs maximum with a brand new filter and the pressure tank full. And there is still the 5 micron filter and UV chamber to go before water gets to the plumbing in the house.

So, given the pressure restrictions and reduced water flow caused by the sediment filters and UV system, is there enough pressure and gpm's left for a CSV to actually work and do it's job effectively? The promise of a steady water supply in the house is very appealing, but is it possible given the system we have?

[Cary Austin]

The CSV1A would certainly hold the pressure steady and strong.  You could set the CSV for 45 PSI constant, and you would have much better pressure than when the pump is continually cycling between 30 and 50 PSI.  But you are losing 12 PSI through one filter and more through other filters before it gets to the house.  So when you have filters that give you 20 PSI loss, you really need a pump that can make up for the pressure loss. 

If you had a pump large enough to work with a 50/70 pressure switch, the CSV could give you a constant 65 PSI.  And after 20 PSI loss you would still have 45 PSI at the house.  Even a pump that would work at 40/60 would be better.

As it is now, when the pressure drops to 30 PSI, and you have 20 PSI loss, you are only getting 10 PSI in the house.  It is hard to even get wet with only 10 PSI.