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  #1  
Old 11-03-2010
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whole boat water filtration

I'd like to set up whole-boat water filtration so I can drink the water from the tap on my boat from either the galley or the head. My boat has FRP water tanks molded into the bilge, so they date from 1979. If you recall my thread about trying to open the tank inspection port, that didn't go so well. I did eventually get a camera inside and learned that a) it's really dirty, and b) even if I got the port open, it would be impossible to fully clean due to the placement of the baffles. So I'm on to filtration.

I need a filter setup that will get rid of bacteria/algae/mold and also anything that might be leeching out of the FRP of the tank itself. I have read a bunch of threads here on SN, and I really like this one in which Maine Sail talks about a simple and cheap filtration system, but I worry that it isn't enough for my circumstances. Do you think I need something more? Perhaps something down to 0.2 microns? This 3M system is more money than I want to spend, but I think it will do the job and only need replacement once a year. Should I perhaps do both in series? I read in another thread that I should do series filters of 5 microns, 0.5 micron and 0.2 microns. Maybe instead I should get a 5 micron filter and then that 3M filter? I'm just looking for the cheapest alternative. I don't want to have to have a Brita on the faucet like in Maine Sail's thread.

Can you guys guide me on which of these possibilities is the most cost effective and will accomplish my goals? Perhaps there is another possibility I have overlooked? Thanks!
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Old 11-03-2010
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if the water is coming in from a body of fresh water you might want to look at these:

BioLogic Pure Water Pack Ultraviolet Water Purifier treats 1.5 gallons per minute and 90 gallons per hour

my buddy installed a version w/ only the uv, but that wont get out the particulates, but it is a bit cheaper.
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Old 11-03-2010
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The water going into the tank is from the city of Boston, it's very clean and treated. The problem is the quality of the water coming out of the tank. I don't think I can justify the cost of that UV filter, though it is intriguing. If the second stage filter was 0.2 microns, I'd consider it, but as-is I don't think it will meet my needs. Thanks for the idea though.
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Step one as a clean water person on Long Island is the tap water is not all that clean anyplace in terms of TDS (TDS describes all solids (usually mineral salts) that are dissolved in water)

By not filtering you tank filling water your putting a good amount of dirt into a closed system that will just clog your final filters

Its very hard to keep water clean on a boat that sits on a mooring 5 days a week in warm weather Vs one in everyday use with regular water movement
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Last edited by tommays; 11-03-2010 at 02:59 PM.
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oh, tommays, who hasnt eaten a mud pie in their life?!?

before making the decision, he had the water (which supplies to the local drinking supply--after some form of treatment im sure) checked by a drinking water assay, and all was good. yet.... i dont like the idea of drinking fish poo
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We check the incoming water all the time as its and right now for example its about TWICE as clean with the cool weather as it was in the peak water use of the summer heat wave
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If a dirty bottom slows you down what do you think it does to your boat
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what was it.... water water all around and lots of poo to drink? har t har har

though this is scary stuff, and that red algae can kill fish, so it cant be good for you!

Public Health: Ameba-related death
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Ryan—

what you want is not a whole boat water filtration system, but a filtration system for the tap that you will be dispensing water for consumption from. If you shock treat the water system on your boat per Peggie Hall's directions and put a filter on the vent line to the water tank, the water should be relatively clean and pathogen free. All you really need at that point is a filter to get rid of any chemical/mineral content and particulates. If your boat has a pressurized water system, using a sink-faucet mounted water filter similar to a PUR or Brita will take care of that for you. You could have a similar filter setup under the counter, in-line with the galley faucet.
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I use one of these filters System IV, $25 at Camping World.

It made a big difference in the taste/odor of the well water at our marina.

Jim
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The other advantage of the faucet mounted filter is that you need only filter drinking water.. not dishwater or any other use.. You switch to 'filter' position when filling a kettle for coffee or tea, or straight drinking, and not for the other uses. Filter usage and life is extended by not filtering water that's not necessary.

We've had the Brita now for several years and its' working well for us.
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