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Old 04-07-2016, 17:24   #1
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Water filter before or after accumulator tank?

I bought a really good .5 micron filter that I want to use to filter the whole system. But I don't want it to kill the water pressure (mainly for showers).

I was thinking if I put the filter between the pump and accumulator tank it would keep the pressure up.

Any thoughts?
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Old 04-07-2016, 18:02   #2
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Re: Water filter before or after accumulator tank?

A .5 micron filter for the whole house (boat) is to small unless preceded by a pre-filter.

https://inspiredliving.com/cuzn-wate...cro-rating.htm
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Old 04-07-2016, 18:20   #3
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Re: Water filter before or after accumulator tank?

A simple 3u charcoal filter after the house pressure pump will take care of most things. A simple point of use filter at the galley sink for your consumption water should do the rest.
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Old 04-07-2016, 18:21   #4
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Re: Water filter before or after accumulator tank?

The micron rating of a filter is only telling you how fine it is. You need to match the filter housing/filter to your system. It will have a given flow rate in GPM or LPM at a given pressure PSI or BAR on it. The finer the micron rating the faster it will plug up compared to a higher micron filter, if properly sized flow should not be effected regarless of filter micorn rating just frequancy of changes required.
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Old 04-07-2016, 22:30   #5
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Re: Water filter before or after accumulator tank?

It's a standard housing/filter size. I believe around 10" long and 2.5 in diameter.

Flow rate of the filter is .75 gpm.

I figured if it is really slow I'd add a separate faucet just for drinking water.

We fill with city water and I add a bit of chlorine as well. I don't think we have anything to worry about. But I understand the real concern are cysts which are resilient to chlorine so wanted to get a filter that would remove them. I'd rather be safe than sorry I guess. Probably overkill.

I do have a small screen type pre-filter.
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Old 04-07-2016, 22:30   #6
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Re: Water filter before or after accumulator tank?

There is no net difference in system performance with the filter in either location. So locate the filter, where it is easiest to maintain.
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Old 04-07-2016, 22:32   #7
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Re: Water filter before or after accumulator tank?

Hey thanks! That's what I was looking for!
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Old 04-07-2016, 23:29   #8
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Re: Water filter before or after accumulator tank?

If its just for cleaning up dock water I would put a male and female garden hose adapter on the housing and put inline from your dock connection. The municipality pressure will do fine with the filter but your potable pump will probably be down to a trickle, it is probably made for about 4 bar or 60-70 psi. I tried one of the all in one cyst etc filters on ours and it was down to nothing, I went with a charcoal instead with the intent of adding the dock filter as described above.
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Old 05-07-2016, 03:50   #9
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Re: Water filter before or after accumulator tank?

I put a .5 immediately after the tanks to remove anyrhing that might clog or damage pumps etc. No reduction in pressure. BTW we also have one for the feed into the tanks and a charcoal on the drinking water line.
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Old 05-07-2016, 09:42   #10
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Re: Water filter before or after accumulator tank?

Quote:
Originally Posted by chad.lawie View Post
It's a standard housing/filter size. I believe around 10" long and 2.5 in diameter.

Flow rate of the filter is .75 gpm.

I figured if it is really slow I'd add a separate faucet just for drinking water.

We fill with city water and I add a bit of chlorine as well. I don't think we have anything to worry about. But I understand the real concern are cysts which are resilient to chlorine so wanted to get a filter that would remove them. I'd rather be safe than sorry I guess. Probably overkill.

I do have a small screen type pre-filter.
That flow rate for the filter is pretty slow, in my opinion. I have my filter placed right before the pump, not after it. Works very well, but it is nowhere that fine.
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Old 05-07-2016, 09:52   #11
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Re: Water filter before or after accumulator tank?

I have a fine screen filter before the pump Every year i find white chunks of oxidized aluminium from the water tanks.
It doesn't matter if the filters are after the pump or the accumulator.
i have 3 filters 10 mic then a 5 mic and then a large charcoal all built with a bypasses.I find that the charcoal filter plugs up after 2,000 liters so i bypassed it and now have a charcoal filter just the galley water.
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Old 05-07-2016, 10:07   #12
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Re: Water filter before or after accumulator tank?

I have to agree with cruisingScotts, filter out as much crap is you can before it gets to your tanks. I use a similar filter to yours with the 3/4 in garden hose fittings to filter the water at the tap on the dock. These cheap filters will stop most of the crud from entering your system and keep your hoses clean too.

For water we drink we also use charcoal filters. We have not had any problems in the 18 months we have been cruising.

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Old 05-07-2016, 10:07   #13
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Re: Water filter before or after accumulator tank?

I recommend after the accumulater. A dirty filter can cause excessive back pressure on pump. Your faucet water flow will diminish as the filter plugs, but the pump is working only against your set pressures.
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Old 05-07-2016, 10:15   #14
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Re: Water filter before or after accumulator tank?

Put your filter after pressure pump. Easier on the pump. Many pumps push thru a restriction better than they suck.
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Old 05-07-2016, 11:08   #15
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Re: Water filter before or after accumulator tank?

I use a 2 micron charcoal filter while filling and another one just on the cold water section for drinking water quality. Change them out every 6 months .
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