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Old 02-02-2014, 07:27 PM   #1
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Under Sink Water Filter - Expensive

On my Winnebago Access there is a 3M water filter under the sink. I decided that I would replace it at the beginning of the season. I did some research and it is a 3M A1 filter that only filters out chlorine. The B1 version filters out smaller particles and other stuff link cysts, etc. I did some research and found that these filters are quite expensive.

I was thinking about using a filter that I connect to the hose feeding the RV (thus servicing the whole RV) and not using the under the sink filter. Thoughts? The only downside I can think of is that the under sink filter filters the water coming from the fresh water tank.

Are there alternate brand filters that would work in place of the 3M A1/B1? I don't want to replace the filter mounting hardware though.
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Old 02-02-2014, 07:54 PM   #2
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I have whole house sediment filter and a carbon filter in the hose to the unit and filter all of the water into the unit. Anytime we have to fill the water tank, I run all of the water through the filters.

The filters are available from Home Depot or Lowe's and all are much less than the 3m filters. They can assist you in getting the right fittings to connect to your hoses.

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Old 02-02-2014, 08:22 PM   #3
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I have not found any other filters that fit the bayonet of the 3M system.
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Old 02-02-2014, 08:27 PM   #4
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Filters have improved over the years and Quality costs money. I have a Everpure ADC EV959206 filter under my sink hooked to the cold water line. Everpure EV959206 Shurflo RV Filter - ADC/QC Only $39.99
Using an exterior filter when hooked up to city water is fine but will not be useful if you're parked on the side of the road or boondocking away from an outside water faucet.
If you use a carbon or equivalent to filter all the water before it enters your fresh water tanks, you will be removing the chlorine that kills bacteria and germs resulting in skanky water and the need to drain, flush and sanitize the fresh water tanks more often.
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Old 02-03-2014, 12:24 AM   #5
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Quote:
Originally Posted by StringFellow View Post
On my Winnebago Access there is a 3M water filter under the sink. I decided that I would replace it at the beginning of the season. I did some research and it is a 3M A1 filter that only filters out chlorine. The B1 version filters out smaller particles and other stuff link cysts, etc. I did some research and found that these filters are quite expensive.

I was thinking about using a filter that I connect to the hose feeding the RV (thus servicing the whole RV) and not using the under the sink filter. Thoughts? The only downside I can think of is that the under sink filter filters the water coming from the fresh water tank.

Are there alternate brand filters that would work in place of the 3M A1/B1? I don't want to replace the filter mounting hardware though.
That setup that I have under my sink is only for the icemaker and yes they cost a bunch. As far as what it filters from, it's what ever you have feeding the coach, be it the potty water tank or the city water. It just taps off of the sink cold water line thru the filter. Camping World does not even carry them and they are expensive but they do a great job of making the ice taste like NOTHING. You can add a whole system filter to the inlet form city water but it won't clean the water you put into your Potty water tank unless you use the potty water fill from city hookup.
The other option is go without, but I would verify that the filter under the sink is not for the ice maker if you have one.
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Old 02-03-2014, 07:10 AM   #6
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I use a sediment filter between the spigot and the coach, this was recommended by Winnebago after my check valves went bad and had to be replaced. They said it was pretty commonfor this type of failure if a coach spends much time in Florida,
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Old 02-03-2014, 09:41 AM   #7
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Before you spend the money on a whole house filter look up the specifications of the ones you're interested in. I think you'll find some of them don't filter out much but sediment. Just like the one under the sink the more it filters the more expensive the replacement cartridges.

We looked at a whole house system a couple times, but decided against it. The ones that filtered the same things as the under counter system cost an arm and a leg for replacement cartridges. To top it off you would be filtering more water for the shower and toilet than for drinking or cooking.

Secondly any water system used in a commercial (i.e. campground) setting is subject to at least annual testing and certification that it meets standards for public consumption.

Here's a link to the type of filter originally installed in our 2013 Adventurer

3M Under Sink Filtration, Replacement Filter, "A"

As you noted it doesn't filter out much. That's probably why the price is only $27.17

Here's a link to the one we used to replace the original. It's a direct fit and filters out much more, but then again it costs more at $38.00

3M Under Sink Filtration, Replacement Filter, "C"
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Old 02-03-2014, 10:53 AM   #8
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I put the under sink plug in an only use a hose filter.
Cheaper. We do not drink the water anyway.
Use bottled for that.
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Old 02-03-2014, 11:15 AM   #9
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We have the ADC filter under the sink for ice maker & drinking tap. It definately removes bad taste, etc. We replace it once a year. We added an sediment filter outside after we had fine sand in the shower. I change it every 3 months and am amazed sometimes at how rust colored it is when using only "approved" city water sources! For sediment filter I use an RVSED-1 (1 micron) from RV Water Filter Store: Standard Filter Canisters for Whole RV. I have not found better than 5 micron at Lowes, etc. I order 4 RVSED-1 filters once a year for a bit over $20 including shipping.
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Old 02-03-2014, 11:52 AM   #10
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We have a carbon house filter that filters both the house tanks and the city water. I have a sediment filter after the water spigot at the RV park. The sediment filters the big chunks and the in-house filter handles most of the taste. I clean and sanitize the tanks after each trip and have not had problems. We use bottled water if we do not like the taste and often bring 4 or 5 gallons from home when we travel.
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