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Old February 13th, 2015, 08:04 AM
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Default R/O prefilter

I'm looking for some info on where to find a good, yet economical, inline prefilter for my R/O and even to prefilter raw sap going into my holding tanks.
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Old February 13th, 2015, 08:22 AM
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Most of us use the blue 20" water filter units. Buy the filters in bulk.. they should be under $3 each.
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Old February 13th, 2015, 08:35 AM
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Thanks. I have 3 of the big blue filters within the r/o. Last year started using a smaller inline prefilter t hat I could purge/flush while running to grab some of the bigger things. They're smiller ones, and won't hold up to the flow of the new r/o. They were the smaller ones available from a general hardware store. Probably overkill, but would like to find something to add some extra filtering. Probably around a 25-30 micron before I get to the 5 micron r/o filters. I haven't actually gotten the r/o delivered yet, so haven't seen the 20" filters. Are t hey a certain type of weave? Or a certain place h o u find them in bulk?
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Old February 13th, 2015, 08:52 AM
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Check out pentek PBH-420 (looks like a 20in. big blue) with a Model BP-420-25 (25 micron) bag filter.

35 gpm service 50 gpm max flow.

They work well as a prefilter.
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Old February 13th, 2015, 08:59 AM
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Thanks, much appreciated.
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Old February 13th, 2015, 09:08 AM
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Use the poly spun filters.
Ebay is usually the cheapest place to buy in bulk.


There are some cheaper..

Cdl makes cloth wraps to put on these cartridges to help filter before the filter.
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Old February 13th, 2015, 09:24 AM
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Thanks for the info.
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Old February 13th, 2015, 09:36 AM
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meflanum welcome to the site Were is Wisc. are you located. I get mine from Roth Sugar Bush In Cadott. I used to use the cloth covers as sapahalic speaks of. I didn't like them because they would get slimy and were a pain to wash. I just change them every day and don't reuse them. I believe the for filters you use the more syrup your making.

Protecting your membrane and keeping bit at full flow is Job #1 so use the best.
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Old February 13th, 2015, 09:46 AM
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I'm in Clear Lake, WI. East of St. Paul, MN. about an hour. Had a Water Guy R/O last year but outgrew it. For the price and the size we were it was a great machine. Rated at 500 gph, and got a little over 300 gph. Took our 2-2.5 ave brix to 8% in 1 pass and more than paid for itself in fuel savings. Learned though that as much prefer filter with it made life so much easier. Had 2500 taps last year and it worked great. Added about 7500 taps this year so outgrew it. Thanks for the info.
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Old February 13th, 2015, 11:32 AM
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I use the bag sap filters and all the sap goes through it when I pump the sap into the tanks and I would think this would make the prefilters last longer. The are the bag filters the maple suppliers sell for about $ 7.
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