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Swap from RO to tap & rain

tam

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5 May 2011
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1,058
I'm moving and logistically it would be easier to swap from remineralised RO to tap+rainwater, I think.

I currently use RO remineralised with Salty Shrimp GH/KH to about 220 TDS.

The tap water report is:

311 mg/l (or parts per million) :Calcium Carbonate
124.4 mg/l (or parts per million) :Calcium
21.646 °C :Degrees Clark
31.1 °F :Degrees French
17.665 °dH :Degrees German
3.11 mmol/l :Millimoles

What would you mix rain/tap proportions too? Anything else I should keep in mind?
 

tam

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5 May 2011
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That was might first thought, but the maths didn't seem to add up.

The Saltyshrimp says 300µS = 6gh, which I work out as 190TDS (dividing by 1.56) so my 220TDS should be about 7GH. I think the tap is about 315TDS, so if I dilute to 220 that's about 12.3GH... which is quite a bit harder.

Maybe I need to test the actual GH's involved.
 

dw1305

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7 Apr 2008
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nr Bath
Hi all,
The Saltyshrimp says 300µS = 6gh...
so if I dilute to 220 that's about 12.3GH... which is quite a bit harder.
Yes that is right I think. It will be other salts in the SaltyShrimp, ones that don't contribute to the dGH. The tap water ions will nearly all be Ca++ and HCO3-, which contributes equally to dGH and dKH.

cheers Darrel
 

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