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I'm not certain. Note that the hardness level is ND in both tests 1 & 2, which indicates that the softener was working. Test #1 was performed in 1994 and test #2 was performed in 2008. The...

How much difference is there between Distilled water and RO water?


Please also note non-detectable levels of CA++ after our softener was installed.

The following quotes describe one application where an optimum level of minerals is beneficial:

Currently using bottled water. Would like to stop relying on bottled water.
To optimize our well water for excellent tea.
I'm not an tea expert either. Please see quotes in original post.

http://www.teaandcoffee.net/0609/tea.htm
http://www.taooftea.com/display.php3?id=&num=22

Our well-water test results:

Hardness - 309 *
Calcium > 60
Iron - 0.317 *
Magnesium - 27.7
TDS...

Thanks for the reply Andy.

For this thread, I'm curious to know which model RO systems have the lowest ratio of waste water to filtered drinking water.

Which brands have membrane pumps?
...

Anyone?

29 views to date and no replies. I sure someone knows which residential ROs are the most efficient. Thanks

Given your professional experience, which of the cost-effective ROs are less likely to have the issues mentioned by the Kenmore/Sears & Whirlpool/Lowes customers? Thanks

The reason I asked about the quality of cost-effective ROs is because of customer reviews I've read about two popular models:

Kenmore Elite 38556 - Sears customer reviews



Whirlpool Gold...

One for residential monitoring.

I saw that fitersfast.com. offers several models, which is why I started this thread. Any recommendations among them? Thanks

While reading this forum, I noticed it was suggested that one should have a TDS meter to monitor the performance of an RO system. Which TDS Meter is recommended. Other than accuracy, what features...

Gary,

Which of the cost-effective ROs has all the of following attributes?
Is the most water efficient
Has the option of a mineral cartridge
Is not likely to leak due to lower-quality...

Andy,

In the K5 Drinking Water Station Cartridge Options brochure (page 2) these two paragraphs describes their Mineral Plus cartridge:


"Mineral Plus—Adds beneficial minerals (magnesium,...

Andy,

Thank you for the very comprehensive reply. You obviously know a great deal about RO systems. It would have taken a very long time for a homeowner like myself to discover so many...

Both of these models appear to be quality-oriented RO systems. What are the most significant differences? A Google search turned up the the following non-specific

Thanks

FWIW, I've been advised by a knowledgeable tech support person at Pentek that due to our levels of TDS (438) & hardness (309), that my idea in the previous post is not likely to yield palatable...

Another possibility might be to:

Continue to use the softener for the bathrooms, laundry & dishwasher
Run an unsoftened cold water line to the kitchen sink that is filtered under the sink or at...

Hi Gary,

Per our water test report, our softened water contains 160 mg/l of sodium. On the advice of a cardiologist, I've been advised not to consume softened water. And yes, I have been...

Andy,

Thanks for explaining about nano membranes.

I inquired about the mineral content of RO water because of information I've read such as:

Per "Chemistry of Hard and Soft Water"

"The...

Hi Andy,

I'm not opposed to an RO. I was just wondering if a de-ionizing filter would offer any advantage to an RO if all one wants to do is reduce the sodium in their softened water so they...

For residential applications that have a water softener:

Is there a demineralizer or another method (other than an RO system or distallation) that's recommended for removing sodium from soft H2O...

Some RO systems offer a:


Nano membrane option to use instead of the reverse osmosis membrane to leave more beneficial minerals in the water
Mineral cartridge to replace some of the beneficial...

Hello All,

I was surfing the web recently and found the Everpure MRS-600 - a commercial food service RO system. What was noteworthy was:


"When comparing the ratio of waste water to permeate...