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post #1 of 7 (permalink) Old 03-12-2005, 07:18 PM Thread Starter
 
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rain water ph?

i have access to a rain water tub but i took a sample.. and the GH reads 0 but the ph is about 7.2... does this seem right? if so how can i lower the ph without altering the GH to much, i want to keep it nice and low to breed some tetras.. the sample was in a linctus bottle which proberly didnt help much, ill have to get a sample in something a bit cleaner.
any ideas? i suppose i could use peat to lower it but how about just useing a PH down, even if it creates algae it wont really matter because its only in a breeding tank. a washing up bowl to be precise
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post #2 of 7 (permalink) Old 03-12-2005, 07:36 PM
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Real clean rainwater has a pH of around 7[Edit: No it has not, like mentioned further below], like the kind you sampled. It doesn't have any buffering, so in areas with "acid rain" it can have a much lower pH due to sulfur dioxide pollution or whatnot.

I would not use pH down, the associated pH fluctuations are probably not a good thing. Peat sounds better...


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post #3 of 7 (permalink) Old 03-12-2005, 07:42 PM
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Additionally, be careful of where the run off into container came from, that in itself can introduce less than natural things.
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post #4 of 7 (permalink) Old 03-13-2005, 02:19 AM
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Quote:
Originally Posted by Wasserpest
Real clean rainwater has a pH of around 7,
Actually, pure rainwater is about pH=5. Since there is no KH, but there is dissolved CO2, it will always be below 7. The same is true for DI/RO water. The scary thing is that "acid" rain can actually be below pH=3! No surprise that it can kill fish in lakes with very little natural KH buffering!

I would guess your rainwater was contaminated by something in the container. Again, no KH so the pH can swing dramatically.

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post #5 of 7 (permalink) Old 03-13-2005, 03:32 AM
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I was wondering about that, rain water is essentially distilled water, but I thought distilled water had a pH of 6. I'll take your word for it though, it's 5.
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post #6 of 7 (permalink) Old 03-13-2005, 08:42 PM Thread Starter
 
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overnight the tube that i tested the ph in seemed to stabilise, its now at 6.6 maybe it was because its been stored for a while with no light or air, i think it just runs from a felt or like concrete asbestos roof.. but i will find out, i dont think it gets much contact with the roof before it reaches the pipes and the barrel, the water seemed to be pretty clear and clean.
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post #7 of 7 (permalink) Old 03-13-2005, 10:05 PM Thread Starter
 
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yup it comes off a felt roof, the cladding is fitted up to a small garden shed and is most proberly plastic PVC or something. looks like ive found a source of good water finaly.

can anyone suggest any methods i can put it thought to make sure its clean enought, partical filtration i know but it doesent really need that, shall i filter it though carbon? or will this change the parameters, the place where it is collected is sort of between towns and away from most pollution. is there anything i should do to remove any fungus or any nastys that will attack eggs?
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