Mr Steve,
It would sound like to me, from your description that your bore is suffering from iron bacteria contamination. This contaminant is a reddish ochre colour. We have this problem often here in OZ and there are several methods of dealing with it. If it is indeed iron, and considering you predicament with your concrete encased pipe work your reverse flushing may well disturb enough of the iron to increase your pumping rates. A more successful option is to induce a non toxic iron dissolving medium in liquid form and circulate this around the bore via your existing pump. There are some of these products available and a brand name of one here in OZ is "Bore Clear" (or is that Clear Bore -whatever) and is aptly named. After a number of hours of circulation dependent on the level of contamination (yours sounds severe) you then pump the dissolved water iron mix over into the bush and continue to pump till the water is obviously clear (remember non-toxic). This treatment has the added advantage of opening up the slots in your steel casing which I would feel are partially blocked as well.
This treatment is about $250 (OZ) for a 20 litre drum and I will need to investigate the make up of this fluid as I know that you are going to ask me this.
Anyway if it keeps the cook happy it will be a cheap investment!
Incidentally how old is the bore and what pump do you have on it? Is it a deep well injector arrangement? Also is the water slightly acid?
Hope some of this helps.
Cheers,
Robin
> Hi Robin
>
> no I don't have a recent analysis, but have plenty of iron and silica in
> the water.
> When the bore is disturbed, the water turns red and occasionally
> corroded bits of the bore liner pipe (steel) get sucked out. After a
> disturbance, the water takes on a cloudy appearance for a few days; it
> looks like colloidal silica. When everything is fine and settled, the
> water is crystal clear and odour free. At the moment, it is milky rust
> brown and has that haem odour.
>
> Cheers
>
> Steve
>
> -----Original Message-----
> From: Robin Badcock [mailto:rbadcock@vision.net.au]
> Sent: Wednesday, July 07, 2004 12:52 AM
> To: PipingDesign@yahoogroups.com
> Subject: Re: [PipingDesign] Bore rehabilitation methods
>
>
> Steve,
>
> Have had a fair bit to do with domestic bore holes and water supplies
> over the years. Do you have a current constituent analysis of your water
> as this will no doubt provide indications as to the nature of the screen
> blockage and you shall be able to make an informed decision as to how
> best to treat this. We have a degree of problems with iron fouling and
> other such build ups that reduce inflows to wells and pump intakes.
>
> Cheers,
>
> Robin
>
>
>
>
> ----- Original Message -----
> From: "Steve McKenzie" <mechproj@xtra.co.nz>
> To: <PipingDesign@yahoogroups.com>
> Sent: Tuesday, July 06, 2004 7:04 PM
> Subject: [PipingDesign] Bore rehabilitation methods
>
>
> > Gents + 1
> >
> > my water bore at home has nearly given up the ghost.
> > I dont know much about it except that it has a 40mm HPDE pipe
> > concreted (at the top) into a 65NB steel liner. And its old. No idea
> > of the depth I cannot extract the HDPE pipe because of the concrete,
> > and if I did, I may not be able to get it back in.
> > The bore is slightly artesian;overflows very slowly at zero load.
> > However if I pump it, the pressure drops to around 7m lift which is
> > all the pump can do. Pumped, I guess the current yield is around 5
> > lpm; used to be about 30 lpm.
> > I suspect the screen is blocked and am wondering about trying a
> > backflush, with either compressed air or water, ot try and clear it.
> > Any ideas/references?
> > Cost of a new bore is $10,000 with no guarantee of water.
> >
> > Cheers
> >
> > Steve
> >
> >
> >
> >
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> >
> >
> >
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> =========================================
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Received on Tue Jul 06 23:17:00 2004
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