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Go Back   SailNet Community > Out There > Cruising & Liveaboard Forum > Water Purification
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Thread: Water Purification Reply to Thread
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Topic Review (Newest First)
10-10-2006 11:48 AM
hellosailor Paul-
Never say never.
" Photosynthetic Algae Altered To Grow Without Sunlight

For the first time, scientists have introduced a fundamental metabolic change in a single-celled alga so that it no longer requires light to grow.
Photosynthetic algae are the major primary producers in aquatic environments. They are also used in industry for food, to make pigments and cosmetics, and for other applications.

Until now, these organisms have mostly been grown in open ponds where the variability of the environment, light limitation and contamination with microbes are frequent problems.

Scientists have now found that by inserting just one gene that catalyzes glucose transport into the diatom Phaeodactylum tricornutum, the organism can thrive in the dark, getting its energy exclusively from the glucose.

This marks a critical first step toward large-scale, high-density, cost effective cultivation of algae using fermentation technology. The results of this study are published in today's issue of Science."
[from http://unisci.com/stories/20012/0615013.htm ]

What about the stuff that grows on the water interface in diesel tanks? Isn't that biomass algae also? Growing without air or light?
10-09-2006 08:34 PM
PaulBl If there is no light then you can never grow algea. Most tanks really are dark inside and so this is not the issue. Algea is a plant that requires sun light.

The issue is what water you choose to put in the tank. Pre filtering water before you add it to the tanks goes farther than anything else. You can rig up a set of two stage whole house filters that you can connect up to your hose to fill your tanks with filtered water. In a dark tank water can stagnate for a long period of time and still be safe. In a tank that gets sun light it won't last more than a week or so and you can never keep it clean.

Publicly treated water is about as chlorinated as required adding more won't really improve the safety of the water. Adding other chemicals probably won't help either. Perfoming a shock treatment on the tank does not require a very high level of Chlorine and should not be needed regualrly. Using a higher does really won't do much more. You need to be kind to your plastic plumbing and high concetrations of chlorine won't help. Don't play chemistry set with your drinking water.

If the water needs Iodine I'm not putting it in my tank.

Adding a tap filter is not a bad way towards making your water taste a bit better either. Put the most attention to what you put inside the tank in the first place. You can't make a cocktail that will clean contaminated water once it is inside the tank.
10-01-2006 03:59 PM
hellosailor "I don't think they used that much iodine"
For some people, yogurt improves intestinal critters, for others, just one cup will trigger lactose intolerance and runs. I'd guess iodine tolerance would also vary with the victim, and how healthy the victim's "critters" were to start with. Like h.pylori (the stomach ulcer bug) and how acidic your stomach is, some people just have difference ecosystems in there.
09-30-2006 11:44 PM
sailingdog True, but I don't think they used that much iodine...However, I wasn't there... so I can't say exactly what happened for sure. Might have been the increased iodine from the salt water...but in either case, I wouldn't want the runs for five days..
09-30-2006 11:16 PM
hellosailor Sailingdog-
Iodine CAN give you the runs, for the same reason that antibiotics often will. Iodine kills all the microcritters, and if there's enough of it in your drinking water, it will neatly kill all the intestinal bacteria just as neatly. Ooops, no bacteria, the gut stops working right.
I'm not sure how dosage-sensitive that is, can't seem to find any information on the web about how much is too much that way.
09-30-2006 03:47 PM
sailingdog
Quote:
Originally Posted by hellosailor
Saltwater parasites in the FRESHwater tank?

Hey, there could be a while ecosystem in there, I"m just looking at what's known to come along with "fresh" water. What kind of saltwater critters have you found in the fresh water supply?
One of my friends got pretty sick during a longer passage in really rough weather...as enough salt water got into the freshwater tanks through the deck fill being under. They knew the tank had gotten some salt water in it and were "purifying" the water with iodine tablets that they had from a camping store. Don't know what it was that made him ill, but he had five days of the runs... UGH...
09-26-2006 04:15 PM
hellosailor "I've seen Puricleann / Aqua Clean," That seems to be chemically the same "bleach" used as a commercial pool cleaner, plus an optional second chemical to neutralize some of the flavor. IOW, a solid form of bleach.
09-26-2006 04:43 AM
erdagte The doc tests it every month.
09-25-2006 11:59 AM
Teredo 'My marina water is good'

How do you know?
09-24-2006 02:55 PM
erdagte My marina water is good and at sea I have a watermaker (save that for a new thread). But the tanks sat stagnant for about a year. I flushed out the system twice a few mnoths ago. I used vinegar (because I didn't know any better). Now I'll do it again with bleach. But assuming I have to fill the tanks, that's a 120 gallons and a lot of pumping.

I've seen Puricleann / Aqua Clean, but haven't given much thought to it. Again, from what I'm reading here, if your marina is serving you good water and you use your tanks regularly, then you should be okay.
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