Rainwater

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28 Nov 2016 08:57 #1 by robert (robert carter)
I have been using rain water to do water changes in my pond for several years now. I was collecting this from the polycarbonate roof of our conservatory, now this has been changed to a solid light weigh roof this is an aluminium tiles effect roof , just wondering would it be safe to rain water off this type of roof . I would of coarse not use the water off it for an initial period .

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28 Nov 2016 22:27 #2 by robert (robert carter)
Replied by robert (robert carter) on topic Rainwater
Sort of surprised no one had any thoughts about this

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28 Nov 2016 23:21 #3 by nomad (pat murphy)
Replied by nomad (pat murphy) on topic Rainwater
Hi Robert my tuppence worth would be that having alluminium contact with water for part changing purposes would be a no no,if it had a surface coating over it in its manufacturing so theres no direct contact i,d say then it would be ok.Just like having a new copper hot water cylinder and pipework would be detrimental to the fish with the copper concentration,see what other responses you get though before making a decision ...

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28 Nov 2016 23:54 #4 by nomad (pat murphy)
Replied by nomad (pat murphy) on topic Rainwater
www.nationalfishpharm.com/koipond/water_quality.html "Run-off water from a nearby stream, or collected rainwater may contain toxic insecticides, herbicides or fertilizers. Rainwater from metal roofs or asbestos shingles will contaminate the pond and may prove toxic to both the fis h, and the plants. If the fish display signs of toxicity, execute a 50% water change and/or remove the fish to safe quarters, or a hospital tank until the water has been changed" .......maybe be safer than sorry and use your tapwater with a good water conditioner like tetra aquasafe while the water war is ongoing and address this issue in the future.

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29 Nov 2016 01:00 #5 by igmillichip (ian millichip)
The toxic effects of aluminium depend on the aluminium compounds formed, and pH can be part of that.

Remember that clays are aluminium compounds...........but not in a form likely to cause problems.
In many blackwaters you may find aluminium compounds.

But, aluminium should be considered toxic in the form you talk about especially in generally acidic water.
However, silicic acid or other silicon rich acid waters can abrogate or reduce aluminium toxicity.

In acid waters, especially, there is a noted ionoregulatory gill dysfunction in aluminium poisoning....and that can also be in concert with osmoregulatory problems.

The chances are that the rain is acidic and further chances are that you don't have a silicic acid (or other acid silicon compound) in your waters unless your water runs over natural clays or other aluminiumsilicates.

ian

Irish Tropical Fish Society (ITFS) Member.

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29 Nov 2016 08:11 #6 by robert (robert carter)
Replied by robert (robert carter) on topic Rainwater
Thanks lads for your views , so i reckon that i wont be useing rainwater any more . At present we havent got a water meter installed but it will come . Anyway for the winter pond water changes reduce to about 10% every second week as the only food going into the pond is for the stergoen

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