Water filter for conversion - Ford Transit USA Forum
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post #1 of 15 (permalink) Old 09-16-2018, 08:07:AM Thread Starter
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Water filter for conversion

Any recommendations on inline water filter? For use with a shurflow 4008 pump. I would like to have the option of filtered water at the sink.
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post #2 of 15 (permalink) Old 09-16-2018, 03:24:PM
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I used a Doulton Ultracarb filter after the pump. Is a ceramic filter that removes heavy metals, chlorine, particles and biological material down to 1/2 micron in size. Our drinking water, water for cooking, face washing, and tooth brushing is filtered. We use a handheld spray nozzle that is not filtered for everything else. The rating for the filter is 600 gallons before it has to be replaced and generally it can be cleaned once. If you are planning to get water from streams or similar sources then you would probably want a pre-filter before the pump. The filter is the white cylinder in the back in the photo below.
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post #3 of 15 (permalink) Old 09-16-2018, 05:36:PM
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I always filter boat water before it goes into the tank. I want zero contaminants in my water system. Like a filter full of bad stuff.


Airlines follow the same practice. There is no use putting "third-world water" in an aircraft water tank without filtering first.



Honolulu residential "water test": fill a water glass half full, place on kitchen counter, wait 3-4 days, "feel the water". Slimey!!!
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post #4 of 15 (permalink) Old 09-16-2018, 06:02:PM Thread Starter
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My concern was getting a .5 micron filter that will work at Shurflow pressure and volume.

Definitely won’t be pumping stream water into tanks. But even potable water can have contaminants perhaps even in my own water jugs. I will have 4 7 gal jugs. I’ve heard a few drips of bleach or a rinse helps. But I’d feel safer drinking filtered water out in the boonies.

Again, looking for real world experience with shurflow. Or recommendations for configbusing another pump.
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post #5 of 15 (permalink) Old 09-17-2018, 12:30:PM
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The best filter is a reverse osmosis filter. I was going to install one but it would take another pump to pressurize the system pre filter. RO has to have pressure to operate.

In the end, after traveling from Texas to Alaska and back, just buying RO water from water fill stations worked best for us (4 months on road and still going). I have 2 seven gallon jugs that you take on the store to fill and pay per gallon. I have 1 seven gallon that I fill with just tap water for washing dishes. Between 28 and 37 cents per gallon... Worth it (no worries over freezing issues this way either). Almost every Walmart has the fill stations.

We also would fill up at fresh ground springs in certain known locations in Alaska and Canada, just natural earth filtration
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post #6 of 15 (permalink) Old 09-17-2018, 01:11:PM
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@WN1A - does that .5 filter slow down water flow? What kind of pump are you using?

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post #7 of 15 (permalink) Old 09-17-2018, 02:58:PM
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Originally Posted by Howling View Post
@WN1A - does that .5 filter slow down water flow? What kind of pump are you using?

I am using a Shurflow 4008 pump 3.00 GPM at 55 PSI. The filter is rated at 0.9 GPM for relatively clean water and at 0.5 GPM at maximum performance. We use the same filter at home, Seattle which has very good water, but over time the flow decreases. Generally the filter can be cleaned once and reused but the activated carbon core performance decreases with time.

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post #8 of 15 (permalink) Old 09-17-2018, 11:54:PM Thread Starter
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@WN1A , researched it and I think that’s the ticket. For $110 I can get filter, housing, hoses, and nice metal tap. Cartridges are $30 so not horribly bad for peace of mind. Thanks!


Reduces the following contaminants:
85% of Atrazine at 1.2 ppb presence
99.99% of Bacteria
97% of Chlorine Taste & Odor
50% of Chloroform at 150 ppb presence
99.99% of Cholera
99.99% of Cryptosporidium
99.99% of Cysts
99.99% of E. Coli
99.99% of Giardia
Herbicides
Insecticide
99.99% of Klebsiella Terrigena
Lead
85% of Lindane
Particulates
Phenols
95% of Polycyclic aromatic hydrocarbons (PAHs)
Salmonella
Sediment
99.99% of Shigella
Total Trihalomethanes (TTHM)
50% of Tricresyl Phosphate (TCP) at 1.2 ppb presence
98% of Turbidity
99.99% of Typhoid
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post #9 of 15 (permalink) Old 04-18-2019, 03:13:PM
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When taking on water in latin america, I'd like to filter before it goes in the tank. And I also plan on filtering all water leaving the tank, since I'm paranoid that way. I was thinking that when boondocking i would just use one of my gravity fed filters - but if i'm stopped at a little cantina and using their spigot, I'd be there for over an hour trying to gravity feed 40 gallons.

Rather than add in a second pump and second filter to speed things up, I'm thinking of plumbing in a loop to force new water through my existing pump and filter.

Even though I'd be feeding unfiltered water into my pump, there's no risk of contaminating anything downstream of my filter.

The best diagram i could come up with still involves moving 2 Y valves in the correct sequence. Any better ideas? The process for filtering new pressurized supply would be:

1. Move the pre filter y valve to "Pressurized water"
2. Move the post filter y valve to "Filter to tank"
3. Wait for tank to fill, and when water starts pouring out of the overflow, turn valves back to original positions.


For gravity fill:
1. Move the pre pump y valve to "Gravity fill"
2. Move the post filter y valve to "Filter to tank"
3. Wait for tank to fill, and when water starts pouring out of the overflow, turn valves back to original positions.

I see a couple of failure point and challenges:
1. Could pressurize the tank if the vent is not sufficient capacity
2. Not sure how reliable the back flow preventers are - if it fails, would contaminate post filter water lines. But this is unlikely since it's not under pressure.
3. My pump is only 2gpm, so filling an empty 40 gallon tank will take 20 minutes. But I don't really want a bigger, noisier, more expensive pump.
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post #10 of 15 (permalink) Old 04-19-2019, 09:31:AM
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Originally Posted by DaveInSeattle View Post
When taking on water in latin america, I'd like to filter before it goes in the tank. And I also plan on filtering all water leaving the tank, since I'm paranoid that way. I was thinking that when boondocking i would just use one of my gravity fed filters - but if i'm stopped at a little cantina and using their spigot, I'd be there for over an hour trying to gravity feed 40 gallons.
Have you considered using a collapsible container that you could fill it quickly and leave it hanging somewhere inside the van that is high enough to gravity feed through the filter into your fresh tank? Come back to refill it when convenient to you until your fresh tank is topped off, then roll it up and stow it when you aren't using it.

Let's call this "thinking inside the box."

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Last edited by Travlin; 04-19-2019 at 09:34:AM.
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