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Old March 8th, 2016, 10:32 AM
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Default Washing at end of Season

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Can anyone suggest a good source for RO cleaning/preservative supplies where I don' t have to buy by the tub size? I just need to clean and store 2 - 2.5 x 21 membranes.

Also, an overview of the cleaning and storage process. (I did read the generic instructions on this forum...)
I believe there is wash, low ph, high ph, then preservative treatment.

I am looking at 10+ days where daytime temperatures will be in the 60s and 70s so I think I am done for the season.

Regards
John
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Old March 8th, 2016, 10:41 AM
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I got our preservative from leader:
https://www.leaderevaporator.com/p-2...servative.aspx
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johnnj (March 8th, 2016)
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Old March 8th, 2016, 01:03 PM
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Thank you - I hadn't even thought to look on their site....

So I see they sell soap, acid and preservative... What about something for creating high pH - do you do a high pH cleaning cycle? I thought that this would be the most important as that is what deals with any organic matter, which I would think would be prevalent.

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John
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Old March 8th, 2016, 04:03 PM
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Default What about soap

I talked to Leader and they will not ship the RO Soap... (Acid and preservative is no problem)

Does anyone out there know where I can buy the soap (again in reasonable quantities)?

Thanks again
John
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Old March 9th, 2016, 12:49 AM
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Soap is high pH. So rinse, soap wash, rinse, acid wash (let sit couple days),rinse, soap wash, rinse, preservative .
Most of the soaps are sodium hydroxide. It is corrosive and usually requires hasmat shipping procedures. You can get it via FedEx and ups, just need to find a dealer that will/can ship it.
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Old March 9th, 2016, 05:44 AM
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CDL has powder soap. Maybe that could be shipped easier than liquid?
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Old March 9th, 2016, 08:01 AM
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Haynes, I agree. - in my case homebrew, so I am figuring it out and need to write it all down in the book so I have it straight.

Also.. Sapaholic,
Thanks for the clarification on the "soap" and that it is sodium hydroxide. I work for a company that buys chemicals all the time. It is amazing what can be shipped via carriers, so I was a little taken aback that something called "soap" can't be. Probably most suppliers just don't want to go through the paperwork (SDS/MSDS, registration, etc.) - No problem however on the metabisulfite and citric acid.

Anyway, I believe that I am all sorted out, and I found the CDL stuff.

It is a little isolated here in NJ in terms of suppliers - we're known more for tomatoes than maple... No wisecracks please

Regards
John
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Old March 9th, 2016, 04:44 PM
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Quote:
Originally Posted by johnnj View Post
So I see they sell soap, acid and preservative... What about something for creating high pH - do you do a high pH cleaning cycle?
"RO Soap" is generally a strong caustic (lye) used to create a hi pH. This will digest most organics that build up on the membrane. Acid isn't recommended in many cases unless you have certain issues and need to "tighten" the membrane, or have pushed the organic crud so far into the membrane that you can't get the flowrates to return with normal washing/rinsing.

You should only clean your RO membranes according to the manufacturer (of the membrane and machine) instructions. If you built the machine, use the recommendations of the membrane manufacturer. Doing otherwise may destroy them. Typically you should wash and rinse after each RO use, not just at the end of the season. At the end of the season there are other steps to follow depending on the membrane, what the flowrates are compared to the benchmark rate, and how you intend to store it.
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Old March 9th, 2016, 08:03 PM
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Quote:
Originally Posted by johnnj View Post
I talked to Leader and they will not ship the RO Soap... (Acid and preservative is no problem)

Does anyone out there know where I can buy the soap (again in reasonable quantities)?

Thanks again
John
Looks like you got this figured out, my apologies for leading you down the wrong path. I feel like I had this same issue as well now that I think about it in that they wouldn't ship. Then I believe I went to this site (Welcome to Sugar Bush Supplies Company) and they shipped with no complaints. Just throwing it out there - my bad johnnj
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http://www.pottercreeksyrup.com/
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Old March 9th, 2016, 08:30 PM
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I got my RO soap and acid from Duda Diesel. They are down south and shipping is very cheap if not free. Depends on how much you buy.

Sodium Hydroxide for the RO soap.

Hydrochloric Acid for the acid wash.
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