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Old 02-15-2013, 10:01 AM   #1
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RODI help

Buying my unit this week yay!! I was looking at buying it from purewaterclub.com what one is the best one there? Not quite sure what I'm looking at. Or maybe suggestions for another one?
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Old 02-15-2013, 10:09 AM   #2
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I bought the cheapest portable one a few days ago, I am curious as well if these are good but for 65 dollars I'm not expecting a whole lot
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Old 02-15-2013, 10:20 AM   #3
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Why would you buy the cheapest one for 65 and risk having some bad stuff in that water, another 65 bucks and u could have had the 4 stage system from bulk reef suply for 125.
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Old 02-15-2013, 11:08 AM   #4
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I expected to pay around $150 maybe a bit more. Quality goes a long way in this hobby! I was looking at 5 or 6 stage is that the best you can go? I was also looking at RBS as there is a group but going on in a week or so!
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Old 02-15-2013, 11:16 AM   #5
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Yes there is, i dont have an rodi system i use distilled from my grocer, 0 tds and 0 phosphates im happy payin 79cents a gallon.
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Old 02-15-2013, 11:55 AM   #6
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Why would I risk? Because I'm cheap. I just won't use it if it tests poorly
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Old 02-15-2013, 12:30 PM   #7
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Originally Posted by J_Anton View Post
I am curious as well if these are good...
I guess the primary factor in determining how good an RO/DI unit is, is the total dissolved solids (TDS) rejection rate of the RO membrane since the RO membrane is the 'work horse' of the unit.

A greater rejection rate will increase the longevity of the DI stage, which ideally should be be producing 0ppm TDS RO/DI water.

An ideal RO membrane should have a TDS rejection rate of 98-99+%. A less than ideal RO membrane may have rejection rate of less than 95%.

Every 2% increase in the rejection TDS rate doubles the longevity of the DI resin. The DI stage following a membrane with a 98% rejection rate lasts twice as long as the DI resin following an RO membrane with a 96% rejection rate and 4x's longer than one with a rejection rate of 94%.

The ultimate cost:
As an example, if the rejection rate of a "cheap" RO membrane is 90% (unit A), then the system is expending the DI resin 16x faster than a high quality membrane with a 98% rejection rate (unit B). The owner of unit A will have gone through 16 DI resin change outs by the time the owner of unit B replaces his DI resin for the first time. A cheap unit may be saving money on the front end but will be wasting money in DI resin replacement. (of course this is under the assumption that cheaper unit means less efficient RO membrane).

To determine the RO membrane rejection rate, substract the TDS of the RO water (not the RO/DI water) from the TDS of the tap water. Divide that figure by the TDS of the tap water and multiply by 100.

Example:
tap water TDS=225, RO water=12
225-12=213.
213/225=0.9466
.9466 X 100=rejection rate of 94.6%

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Old 02-15-2013, 12:33 PM   #8
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I bought a cheap 4stage from purewater and it works great so long as it has the ro/ membrane and the di stage you should be good thefirst 2 stages are charcoal filters just don't run it horizontally
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Old 02-15-2013, 12:56 PM   #9
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Quote:
Originally Posted by kay-bee19 View Post

I guess the primary factor in determining how good an RO/DI unit is, is the total dissolved solids (TDS) rejection rate of the RO membrane since the RO membrane is the 'work horse' of the unit.

A greater rejection rate will increase the longevity of the DI stage, which ideally should be be producing 0ppm TDS RO/DI water.

An ideal RO membrane should have a TDS rejection rate of 98-99+%. A less than ideal RO membrane may have rejection rate of less than 95%.

Every 2% increase in the rejection TDS rate doubles the longevity of the DI resin. The DI stage following a membrane with a 98% rejection rate lasts twice as long as the DI resin following an RO membrane with a 96% rejection rate and 4x's longer than one with a rejection rate of 94%.

The ultimate cost:
As an example, if the rejection rate of a "cheap" RO membrane is 90% (unit A), then the system is expending the DI resin 16x faster than a high quality membrane with a 98% rejection rate (unit B). The owner of unit A will have gone through 16 DI resin change outs by the time the owner of unit B replaces his DI resin for the first time. A cheap unit may be saving money on the front end but will be wasting money in DI resin replacement. (of course this is under the assumption that cheaper unit means less efficient RO membrane).

To determine the RO membrane rejection rate, substract the TDS of the RO water (not the RO/DI water) from the TDS of the tap water. Divide that figure by the TDS of the tap water and multiply by 100.

Example:
tap water TDS=225, RO water=12
225-12=213.
213/225=0.9466
.9466 X 100=rejection rate of 94.6%
Holy smokes!! Great info! So should I be looking at stage 5 or 6?
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Old 02-15-2013, 02:49 PM   #10
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Holy smokes!! Great info! So should I be looking at stage 5 or 6?
I run a 6 stage and love it!! Two DI chambers, two carbon chambers, one sediment chamber and then the membrane.

This is the unit I own.

http://www.watergeneral.com/product01.aspx
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