RO/DI Thermostatic Mixing Valve

[55G NewB]

So I installed my RO/DI the other day, and production is pretty low, due in large part I think to the 55 F incoming feed water (we are on a well). I had thought about coiling several loops of supply tubing in the sump to pre-heat the feedwater and make the membrane, but this increased length would add additional headloss to the system, thus tending to reduce production, and partially negate the intended result.

I then thought of the anti-scald type shower valves, and figured that I should be able to do something similar. A google for Thermal Mixing Valve came up with several hits, but this one is the only I have found so far that is adjustable to as low as 80 F (most of the rest only go down to 30 C (88 F if my math is correct):

http://www.wattscanada.ca/default.ht...xingvalves.htm

Has anyone tried anything like this, and if so, what kind of results did you have? I know this may seem like overkill, but my 75 gpd Typhoon III is currently only giving me about 16 gpd (still breaking in though, manufacturer states it will take ~ 96 hours to reach full flow).

Thanks

[55G NewB]

So I guess that no one has done anything like this?

[jonnosteams]

Don't know if many would know much about this and your situation.

I'm not that familiar with it myself.

Could possibly putting the RO/DI unit in the well house help? Granted, the problem then would be transporting the water. Is it possible to gravity feed from the well house to a holding tank and drip a top off? Or could the RO water then be pumped to the house?

Anybody else have and ideas? Maybe I'm missing the point.

[VWD]

What is Your pressure going into the RO/DI unit, I think If You are getting only 16 gpd out of a 75 gpd unit and the water id 55 deg. f. you may have a pressure problem. and did You do everything you needed to do when You installed it. That is not a breaking in problem.

[55G NewB]

Vince,

Inlet pressure is approximately 55-60 psi. That is about as high as I can get it with the pressure adjustment. I am hoping that break-in will increase production to closer to rated output.

[yardboy]

55G, look here: http://www.gewater.com/library/tp/700_Six_Pieces.jsp

It has a graph that shows you should be getting about 75% of the rated flow out of your RO with that temperature. Normally flow rates are figured on 45#, I think, so you may have some other problem besides temperature. That article also suggests that when you have lower temperatures you can lower the waste flow rate (thus increasing permeate flow) with a higher flow restrictor. You may be able to get this from the RO/DI manufacturer or you may have to put a valve on the waste line to throttle it back some.

[VWD]

Your pressure is good and the temp is cool but not that bad, like yardboy , I think You are having some other problem and may be able to do the thing that he said and put a valve in thewaste output and force more to the good output. Let us know .