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 Post subject: Re: Reverse Osmosis System
PostPosted: Tue Oct 12, 2010 2:50 pm 
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Customer

Joined: Fri Oct 16, 2009 3:59 pm
Posts: 346
Location: Texas
TDS by definition is a measure of all dissolved solids. Dissolved solids by definition do not settle. If settling is removing anything, then a sediment filter may be called for.

If anyone notices a precipitate after letting municipal water "settle" you really should call your water company.


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 Post subject: Re: Reverse Osmosis System
PostPosted: Wed Oct 13, 2010 6:47 am 
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Joined: Fri Sep 17, 2010 7:52 am
Posts: 302
Location: Oak Island, NC
Peter,

All of the systems I sell have opaque filter cartridge canisters.

Suss, if you have chloramines in your water supply, I'd go with a 5-stage system, as that 2nd carbon filter helps with the life of the membrane.

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Ray Barkalow, Orchid Iconoclast
Using science & logic to improve orchid growing


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 Post subject: Re: Reverse Osmosis System
PostPosted: Wed Oct 13, 2010 7:10 am 
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Customer

Joined: Wed Oct 11, 2006 6:32 am
Posts: 2675
Location: Norfolk, VA
Thanks Ray, in fact I do have the 5 stage system - but is it the same base model as the Peter posted. Water passes through a Pentek Chlor-Plus 10 filter before hitting the membrane. Plus I really have very good water (low TDS, less than 100 ppm) to begin with... so I really do not have to use it much, but like to have the filtered water available. As mentioned prior - I have all domestic water going through a Pentek Chlor-Plus 10 filter also. Your municipal water provider typical mails (or posts online) the results of their quarterly testing and lists the additive they use to prevent issues. You can check to see if they add choramines which are much more persistent than chorine and difficult to remove without a specifically designed filter. I did try other commercially available filters (i.e. HD, Lowes, Charley's) that claimed to remove chloramines... but after testing multiple times, failed to remove them. I learned from a call to the manufacturer that the filter can not remove high concentrations of chloramines.


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 Post subject: Re: Reverse Osmosis System
PostPosted: Thu Aug 25, 2011 4:00 pm 
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Customer

Joined: Sun Mar 01, 2009 5:37 pm
Posts: 88
Location: Michigan
Hello,

It's been two years since the original post, but I have a followup question.

We have well water that has very high levels of iron. That gives me two options - using water that comes directly from the well, or using water that has already gone through our salt-based softener.

On the other hand, we have an electric dehumidifier that removes excessive moisture from our basement. That gives me a gallon or so of distilled water every 24 hours. I store the distilled water in a covered, plastic, 5-gallon pail.

Does anyone have experience using distilled water? I am currently using the raw well water with MSU fertilizer.

Thanks in advance,

Dave


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 Post subject: Re: Reverse Osmosis System
PostPosted: Thu Aug 25, 2011 6:38 pm 
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Customer

Joined: Wed Oct 11, 2006 6:32 am
Posts: 2675
Location: Norfolk, VA
Dave have you ever tested your well water? I had mine tested and it was actually OK, except a high iron content. I bought a filter housing and a specific iron filter and was set. I use it 50/50 with my R/O water to fertilize. I also use it to flush pots if I remember to draw it into my 20 gal pails, it is still cold in the summer - mid 50's.

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Tony B.


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 Post subject: Re: Reverse Osmosis System
PostPosted: Thu Aug 25, 2011 7:09 pm 
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Joined: Fri Oct 24, 2003 1:57 pm
Posts: 16401
Images: 69
Location: Texas, USA
I did a search on whether it is safe to use water from dehumidifier and this is what I found on the internet.

Quote:
General dehumidifier water is considered a rather clean kind of greywater: not suitable for drinking, but acceptable for watering plants, though not garden vegetables[3] The concerns are:[3]
• the water may contain trace metal from the solder, most significantly lead (which is quite damaging), but also copper, aluminium, and zinc;
• various pathogens accumulate in the water, particularly due to its stagnancy, including fungal spores; unlike in distilled water, the water is not boiled, which would kill pathogens (including bacteria);
• as with distilled water, minerals are largely absent, hence it is somewhat flat tasting.
The trace metal poses a danger if used on edible plants, as they can accumulate; however, the water is otherwise usable for irrigation.
One can make food-grade dehumidifiers (avoiding toxic metal and keeping the collection tank clean), which are called atmospheric water generators.

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Peter Lin, Admin
Big Leaf Orchids


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 Post subject: Re: Reverse Osmosis System
PostPosted: Thu Aug 25, 2011 7:49 pm 
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Customer

Joined: Sun Mar 01, 2009 5:37 pm
Posts: 88
Location: Michigan
Thanks Tony and Peter.

I have considered an iron filter -- the residual iron that passes through our water softener wreaks havoc with our plumbing fixtures. The up front cost of an iron filter is pretty steep, but it surely would solve both problems once and for all.

Dave


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