Join Date: Nov 2008
Location: Deale, MD
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Re: Best filtration for freshwater: just particles, or carbon too
Is the carbon "good food" or do the bacterium thrive on other compounds and materials absorbed to there surface? Given that fire char is quite durable in the environment and that granulated carbon is not very compostable, I assume it is the former. Most filter media are vulnerable this way, though the great depth and surface area of carbon make the problem more severe.
I've not been able to find much independent work on KDF (a copper/zinc alloy with some interesting behavior) media. Typically it is combined with carbon because there are some things it does better, and because it prevents infection of the carbon (a claim which EPA seems to accept). Unfortunately, like much of what goes on with carbon (combined adsorptive and catalytic processes), many of the mechanism are guessed at. You could say they are deduced from evidence and our understanding of chemistry, but seems to be a reach.
UV is interesting, but there are some challenges. I would like to hear the answers. I'm not sure how practical this is on a boat.
a. You could treat the tank, but that does nothing for the pipes.
b. You can treat the tap, but the lamps need a 20-30 second warm-up period. Most folks won't want to wait. Leaving it on is not practical because of the current draw.
c. UV is going to destroy plastic parts if the exposure is continuous. This is short wave UV, more damaging than sunlight. Just something to remember.
d. You're going to need some interlocks. Folks aren't going to clean the bulb sleeve unless they have to.
I don't think the "no filtration while loading" is the best approach. I fully understand the practicalities of time, but I've seen too much gook come from pipes; the more gook, the less chance I have of controlling growth in the tank. I started this thread in search of a middle ground with a rational behind it. In my mind the tank WILL become infected and the goal should be to minimize the amount of gook and biomass, so that down stream drinking water systems are not over loaded, and so that the water is still useable for bathing and such. Avoiding dead stink bugs, wasps, and gook from the inside of marina hoses and plumbing are the goal.
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")
"Well, I just climb up to them."
by Joe Brown, English rock climber
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