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695 posts

Ultimate Geek
+1 received by user: 153

  Reply # 1199379 17-Dec-2014 17:47
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SepticSceptic: Have a rain water tank for the last 7 years, never cleaned, untreated and have had one dose of Giardia.  It was the most painful bouts of guts ache I have ever had.


Ahhhh...  Giardia is definitely a consideration, and I think they warn you about on the DOC tracks.   Our well water has a separate filtered feed for the house, but it is nothing fancy, and it does not reduce water pressure indoors (we have to wear a wetsuit in the shower to stop skin being blasted off!)

I am not sure if you can filter out Giadia, or if you have to boil or use nasty tasting chemicals, but this CDC page has some info.

Sure as hell glad I never fell foul of it from my tramping days! frown

Trevor Dennis
Rapaura (near Blenheim)

270 posts

Ultimate Geek
+1 received by user: 37


  Reply # 1199412 17-Dec-2014 18:37
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I installed a filtration (mesh for solids, and charcoal)

Charcoal is typically to remove chlorine and odours, neither of which you should have on a rain only supply.  Odour from tank tends to mean something was once swimming in the tank, and is now floating in the tank...

To the OP:
Have you had your spring water tested.  I'd want to check for Nitrate levels.  You said you have discounted water softeners, so I'm assuming there is some iron or manganese in your spring supply?

With regards to the two systems, just some general thoughts really:
If you install UV then you'd kinda want to be passing all your water through this.  If it's a closed spring then maybe no need, but just a thought.

Rain water is acidic.  Do you have a concrete tank?  If not then look out for blue staining in the bath etc IF you have copper piping or a copper hot water cylinder.  (though not an issue anymore if you're not routing that source through the wet back).

Basically Giardia is the roof collected bit to watch out for.  Many people are fed off water tanks and generally it's pretty good, right up until it isn't.
It's basically like saying I haven't ever had food poisoning, which may be true, but that's doesn't mean you wont tomorrow.  Over to you how significant that potential is in your life.

We live near a pine tree laden area, lots of pollen on the roof at times, which a first flush diverter does nothing to resolve. Simply safer to use charcoal as a barrier to any potential organic matter.

Michael Skyrme - Instrumentation & Controls

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