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Re: RO/DI System vs. TapWater Purifier

Hi Neil,

If you are handy & comfortable with handling chemicals you can recharge
those TWP DI resins using the procedures on this page:


This is the website of the guy who invented the procedure.  He has
recharged resins over 300+ time with no degradation of water quality (only
the color dye wears out).

It's pretty simple & quite cheap to recharge.  The first recharge will
probably take you 2 hours but since the resins are separated the rechages
you do after that would probably take only 20 minutes.

If you are thinking of installing an RO or RO/DI system here some info on
how to increase your water production while reducing your waste water
(because I know some people have to pay for the water that they use).

[from a usenet thread]

Most RO unit ratings are based on the following baseline data:

500 ppm Total Dissolved Solids in the water
ie.  The more solids in the water the higher the pure/waste water ratio is.

77F source water tempurature
ie. the high the tempurature the more productive the RO membrane is.

60psi water pressure.
ie. The higher the water pressure....... the more water can be produced.

Three factors effect the production of RO water:

1.  Total Organic & Inorganic material in the source water.
You can't really change this (thats why you are using an RO unit)

2.  Source Water Pressure
You can buy pressure pumps (I think that Kent makes one) to increase the
water pressure.  Most water pressure (at least in major citys) is 60 PSI.
The minimum PSI to operate an RO unit is 45 PSI.

3.  Source Water Tempurature.
The e-mail below is an idea that I got from one of my reef keeping lists.
It has inceased the production of my RO water by quite a bit.

[question to SpectraPure]
> My  ro unit is not producing the rated gpd that is specified.  I know that
> the production rate is depended on three things: 1. water temp. 2. water
> pressure and 3. solids in the water.  The water pressure is strong (65 psi)
> and the solids are actually very low (150 ppm), so the only thing that
> could be causing my lower production rate is the low water tempurature of
> the feed water (around 45 degrees).  I recieved this idea from one of my
> reef lists to increase the water production of my ro unit (CSP/DI 50 GPD):
> 'I came across a neat strategy for increasing the output of RO units, and I
> thought I'd pass it on. Tell me if you've heard this one before. Take a 5
> gallon bucket, fill it with warm water (or toss in a heater), and run about
> 50 feet of high pressure turbing from the spigot to the RO unit - coil the
> 50 ft. length into the bucket of warm water. Voila - a heat exchanger.
> Around here where the water is about 45 degrees at 80 psi, this trick
> tripled my output...'
> I was just wondering if the quality of the water produced would decrease
> with the increase in water tempurature.  Any information that you could
> give me would be appreciated.  Thanks.

[Answer from SpectraPure]
>>Thanks for sharing the idea. We have heard of several similar solutions,
>>including ( After doing what you have done) returning the waste water to the
>>container to capture more of the BTU's.
>>The Purity will drop ever so slightly, less than 1%


I hope this helps.  Good Luck with whatever you do.

Victor Eng							Vancouver, BC, Canada
engfam at axion_net