GH = 0, kH=240, What does this mean? - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 12 Old 03-08-2012, 10:17 AM
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Originally Posted by Quantum View Post
Yes, all three water systems have low GH and KH untreated water. But I think the data supports my statement regarding the soda ash. The Capilano system does not adjust for pH or hardness and those parameters are little changed from untreated to treated. The Seymour system uses CaO (lime or quicklime) to increase pH and alkalinity, and the numbers reflect this: from 3.3 untreated to 8.4 treated for alkalinity and 6.4 to 7.1 for pH. The lime also increases Ca (1.62 to 3.27), which in turn, increases hardness from 4.64 to 8.77. The Coquitlam system is the one that uses the soda ash. Notice the big increase in alkalinity in the treated water (from 1.7 to 11.4), pH increases from 6.3 to 7.3. The amount of Ca and Mg (and therefore GH) is not affected.
Agree. Notice these numbers are mg/l which equates to ppm, so even after the increases the KH is still well below 1 dKH. Which is very low and not going to buffer anything.

Our water comes from all three reserviors as far as I know, it is mixed. The lime addition is new, I think it was scheduled to go into operation last year. I've seen no changes in tap water so I'm not worrying.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #12 of 12 Old 03-08-2012, 05:11 PM
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so even after the increases the KH is still well below 1 dKH. Which is very low and not going to buffer anything
yes, point taken - more but still not much and very soft even with the treatment
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