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Old October 1st, 2012, 06:25 PM
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Default min taps on an ro

I was told today by a dealer that If I ran a 600 gph ro on 400 taps that I would never have enough rinse water to flush the membrane properly. That I would either have to increase tap numbers or go with a smaller ro. I realize that this size is a little big but I want 8 percent on the first pass.I have 400 taps available rite now and can add another 200 or so pretty easy.I was under the assumption that if you ran thru what you squeezed out then all is ok- what do you guys think?-foamy
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Old October 1st, 2012, 06:54 PM
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foamy; Rule of thumb is the you need as much rinse water as the RO is rated per hour.
We have A 150gph Lapierre and rinse with no less than 3-400 gallons.Might be over kil but the membrane tested 100% when we had it cleaned buy Lapierre last year.
It does not pass any sugar when we run to 8% concentrate on one pass.
Just our thoughts


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Old October 1st, 2012, 08:21 PM
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Foamy, if you can do 600 taps on vac, you'll have enough, but just. I have a turbo 250, on 700 taps this past season. I have a 400 gal perm tank. If I have 600 gal of sap or more I'll have the full 400 gal of perm. If I only have 200 gal of sap and it looks like there will be sap the next day I squeeze it down to get as much perm as I can, then flush the sugar out of the membranes, then do a cold rinse with 50 gal or so, saving the rest for the next day. If I get after a couple slow days like that I've saved enough perm to do a soap wash and full rinse. If you only have the 400 taps you'd be tight. If you do 600 taps on vac you'll never regret the 600 RO, plus you'll have room for expansion without buying a bigger one. I will have 1,000 taps on vac next year and my 250 is already too small, but it'll have to do for another season.
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Old October 1st, 2012, 09:49 PM
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I would agree with the dealer. My ro will make 8-10% one pass just not quite as fast as I can boil. I have a 300 gallon permeate tank and like to see it full when I run a soap wash. This gives me enough to rinse out sugar, wash and rinse with the rest. I prefer to use more than recommended to rinse. Some days with light runs I will squeeze it a little harder to get enough permeate.
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Old October 2nd, 2012, 08:06 AM
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This is a good conversation. I was wondering how to decide, how large a ro to buy. And when should you even condsider it. I just got ray's brochure that Dennis had posted and was looking at his smallest one. For use with my 2x6.

Must admit I would like to see a couple of years of normal sap flow again before I leap at a RO..

The backflow conversation was something I did not know. Needing 1 to 3 times the amount of water (permate) to backflow. And I am assuming you cannot use well water because of the minerals. You need the pure water to flush contaminates.

I will go back to reading new posts on this thread.

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Old October 2nd, 2012, 10:01 AM
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Quote:
Originally Posted by lastwoodsman View Post
The backflow conversation was something I did not know. Needing 1 to 3 times the amount of water (permate) to backflow. And I am assuming you cannot use well water because of the minerals. You need the pure water to flush contaminates.

It seems to be general recommendation of manufacturers to not use well water. And this may seem like nitt picking but it is not "back flushing" it is more like "flushing".
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Old October 2nd, 2012, 10:47 AM
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Guys ; All manufactures that we have had dealings with said DON"T USE WELL water to back flush. Too many minerals in well water and will plug up the membrane.

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Old October 2nd, 2012, 12:03 PM
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Quote:
Originally Posted by Jim Brown View Post
All manufactures that we have had dealings with said DON"T USE WELL water to back flush.
Add "DON'T USE MUNICIPAL WATER" to that as well. Chlorine is really bad for most membranes.
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Old October 2nd, 2012, 03:24 PM
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I have looked at the cdl 250 gph hobby ro. I was told that these smaller (under 300gph) ro's will only get me 4 % from 2% sap on one pass and without the recirculating pump of the larger unit, higher concentrate levels could not be obtained unless you ran sap into a tank then ran that same sap again and again thru the machine. Each time you run the sap thru the performance of the membrane goes down. Maybe its just me but this seems like alot of monkeying around for 8% sap. -------what about rain water for rinse,Just a thought
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Old October 2nd, 2012, 03:29 PM
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Lapiere turbo 250's have a recirculation pump built into the membrane housing. You should be able to go to 8% in one pass if you don't need to keep up with an evaporator. It would be better for the membranes to run two passes to get to 8, no different than most RO's.
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