water parameters needed?

[koihaku]

I have tested: Ph, Kh, Gh, Amonia, Nitrite, Nitrate and these are at acceptable level.
Is there another water parameters needed to make our koi healthy such as phospate, fe,etc?
I ask this because I use ground water which may contain dangerous material for koi.
and I think my water contain phospate since the waterfall stone have white spot when it is dry.is it dangerous?
thanks for your sharing

rgds,
koihaku

[bardies]

I am very interested in what others have to say, but something I've used that you didnt list is a salt test kit. I didnt thing it was possible with ground water - but I've heard our city well described as 'salty', and salt would certainly leave white deposits on your rocks.
Kim

[PapaBear]

I would suspect salt and/or lime scale. It just depends on the specifics of your water chemistry.

Koihaku,
"Acceptable" is far too generic a term. DETAILS, as in real test numbers are needed to even start down the road to a definitive answer

Bardies,
It is likely that you may have naturally elevated salt levels compared to what you are accustomed to. Many of the surface water sources in Oklahoma are naturally on the saline side. Add to that the extensive Oil Well drilling that took place 50-60 years ago (before they knew any better) which unfortunately contaminated many fresh water wells with salt water.

[koihaku]

sorry for being generic...
my ph about 7,5
my gh about 6 dh
kh about 5 dh
amonia=0
nitrite =0
nitrate=0


i'm affraid there are other things to be tested to make sure the water harmless specially phospate and Fe (iron).are these harmless?

the source water is clear visually

koihaku

Quote: Originally Posted by PapaBear I would suspect salt and/or lime scale. It just depends on the specifics of your water chemistry. Koihaku, "Acceptable" is far too generic a term. DETAILS, as in real test numbers are needed to even start down the road to a definitive answer Bardies, It is likely that you may have naturally elevated salt levels compared to what you are accustomed to. Many of the surface water sources in Oklahoma are naturally on the saline side. Add to that the extensive Oil Well drilling that took place 50-60 years ago (before they knew any better) which unfortunately contaminated many fresh water wells with salt water.

[PapaBear]

Your mineral content and ph are very comfortably on the low side. Can you possibly get a good closeup picture of the white deposits?
I'm thinking as I type, so this may be a bit of a ramble.
If you had a phosphate problem you would probably be fighting a running battle with algae, but you did not mention green water or string algae.
Iron would leave a reddish brown stain like rust, so that is unlikely as well.
I don't know if high zinc or magnesium levels would cause this or not, but I think your gh would be higher if that were the case. I could be wrong about that though.
Lime content high enough to leave scale deposits would probably have your ph running much higher than 7.5
One possibility that comes to mind is a strain of freshwater algae I hadn't heard of until recently. It does leave a calcified crust on surfaces when it dies, but I have no idea if that could be it.
You mention that your water supply is from surface water. Is it a private source pond, or a treated city water supply from a lake?
Maybe some of our resident water chemistry pro's could chime in here.