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[Cliff Donnelly]

Calling all sdmas members, you save 10% with every purchase from Air Water & Ice. Use the code #92122 at check out. Come see us soon.:D

[h20poloman2]

Thanks Cliff, I'm going to be in the market for upgrading my RO/DI unit but I'm definitely concerned about the volume of waste water output. I've been looking at the Spectrapure 1:1 ratio unit but obviously it isn't cheap. I've heard great things about your units but I'm curious as to what type of waste water ratio is typical for your Neptune 200GPD system?


http://www.airwaterice.com/product/1NEPTUNE/NEPTUNE_200GPD_RODI_With_2_Membranes_3_DI_Cartridg es.html

[nahtanoj]

NICE!!! my procratinating payed off for once. i need new membranes on my ro/di unit.

[Cliff Donnelly]

The typical waste to pure water ratio is 3-4 to 1. That's the industry standard. Other companies have units that recycle the waste water through the system to get lower ratios. They also say that you'll get good membrane life. Here's the problem:

RO membranes are self-cleaning. They have to waste water. Waste water is higher in TDS than your tap water. Recycling the waste water back through the system means that the membrane now has dirtier water to purify.

A better idea is to have two membranes and plumb the waste water of the first membrane into the input of the second. This means that the second membrane is working harder than the first, but it's not such a big problem if the second one fails before the first.

We can set up the Neptune that way. If we do, you'll be getting more like a 3 to 2 (waste to pure) ratio. Not as good as the other system you're looking at, but most likely more cost efficient.

[victortrav]

thank you very much for your support

[Jessy]

Sorry I had questions on this as well. I read that the waste water is pumped into your hot water line and is flushed out through your dishwasher, washing mashine, and shower... not back through the membranes. So other than getting a little harder water on your clothes, it really wouldn't effect the membranes right?

The typical waste to pure water ratio is 3-4 to 1. That's the industry standard. Other companies have units that recycle the waste water through the system to get lower ratios. They also say that you'll get good membrane life. Here's the problem:

RO membranes are self-cleaning. They have to waste water. Waste water is higher in TDS than your tap water. Recycling the waste water back through the system means that the membrane now has dirtier water to purify.

A better idea is to have two membranes and plumb the waste water of the first membrane into the input of the second. This means that the second membrane is working harder than the first, but it's not such a big problem if the second one fails before the first.

We can set up the Neptune that way. If we do, you'll be getting more like a 3 to 2 (waste to pure) ratio. Not as good as the other system you're looking at, but most likely more cost efficient.