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Old 11-12-2005, 12:48 AM   #11
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pvc piping is A-ok, without a doubt, even the chemicals to clean and seal the joints are safe.

sorry about the metal suggestions though, you see metal in tanks on occasion from algea scrappers made by major manufactors (like kent marine) and even titanium probes in high end salt water sensory kits. no idea why those metals don't cause problems, i have had several power heads in use on my reef tanks for 5yr+ yrs and never had them corrode. anyway i am still astonished by DeFeKt's disputatious comments though.
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Old 11-12-2005, 03:15 AM   #12
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If metals are so dangerous, then in the wild, why do fish make homes out of them, like soda cans, etc, and live a natural life?
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Old 11-12-2005, 04:10 AM   #13
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Wolf - your forgetting about water volume, a lake will have several thousand (maybe even 100-thousand) gallons, and that one 1 pop can won't do much to the whole system. Pearl harbor is loaded full of ships with corals growing on and around them, that’s because the ocean is billions of gallons large, and its sweeping in new tides all the time, and pushing the 'toxic' water to less inhabited areas, or maybe an algae farm that will actually 'use' the metals. In our tanks we have 20-200 gallons, and maybe 20% of the total volume gets changed out once a month. Metal will have a much more drastic effect on the aquarium system, than the wild ecosystem because of how much water (or less water) they have.

And if any veterans are browsing the forum today, I just wanted to personally thank you for your service.
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Old 11-12-2005, 06:34 AM   #14
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Just use whatever metal you want and coat it in clear plastic. thats only if you want a REAL metal look.
Just an idea. lol
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Old 11-12-2005, 07:09 AM   #15
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Thats what i suggested earlier. Where can you get that kind of paint on plastic?
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Old 11-12-2005, 04:13 PM   #16
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It waa mentioned on another thread that zinc is non toxic. Is this true?
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Old 11-13-2005, 01:14 PM   #17
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lol.. I was waiting for someone to say that PVC leaches phospate.. LOL
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Old 11-13-2005, 02:55 PM   #18
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sigh... green.. why even bother stirring the pot? lol
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Old 11-13-2005, 10:06 PM   #19
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a good coating of aquarium safe sealert I imagine would be fine untill it wears off.

It's not the metals that are toxic, it's the oxides (rust) that form on them.
A pump running 24/7 with moving metal componants in it does not sit still long enough for it to start corroding.
You'll also find that they do not have "bare" steel screws or anything, they are 99% of the time powder coated or anodised. If not, it's a cheap pump. They are also covered in a lubricant/soft sealer, like vaseline to prevent seeping into certain areas which would do the same thing.
As for zinc, I don't know the content of it or the percentages, i've never worked with it. however, Austal Ships where i did my apprenticeship puts a zinc anode on the bottom of their boat hulls every few metres, what happens is they run an electrical current to it and start corrosion in the blocks. It attracts the elements that start the process and the blocks of zinc are eaten away before the aluminium hull starts to corrode. So instead of pulling a 100metre boat out of the water once a year to revamp the aluminium under the water line, you just send a diver down to replace the anodes. I can imagine then that this would be more lethal then the others due to it's quick decaying capability.
Also keep in mind, this won't happen straight away, but it will happen.

HTH

Matt.
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Old 11-14-2005, 05:35 AM   #20
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Hmmm right then...i'll have to put some more thought into this then...
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