pH testing

penfold2(4b, MN)March 29, 2011

What do you guys use for testing pH? I need to check it because I acidify my water. I have a meter, but it is a pain to use because the value slowly increases, taking about 5 minutes to settle on a steady value. Then if I swirl it around, the value changes again. I don't feel very confident in its accuracy. Does it just need a new probe? Should I switch to test strips, or a reagent test kit?

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tapla (mid-MI z5b-6a)

I always suggest you get an inexpensive pond or aquarium test kit & use it to see how much vinegar or citric acid it takes to reduce a given volume of fresh tap water to something a little below your target pH. Your water will rise in pH as it gives gasses out dissolved CO2, so it's a little better to shoot low. After you determine how much it took, just add that much acid to that same volume of water, whenever you water. Inexpensive pH meters that can't be calibrated are extremely inaccurate, btw.


    Bookmark   March 29, 2011 at 6:04PM
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penfold2(4b, MN)

Thanks, Al. I think I'll look for a test kit. Some of the aquarium ones don't go down to my target value of 5.8, but I see there are some wide range kits that do. As for the CO2 issue, I use a paint mixer to ensure CO2 equilibrium before testing, so no problem there.

    Bookmark   March 29, 2011 at 8:28PM
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tapla (mid-MI z5b-6a)

Ah - you're 'all over it', I see. ;o)


    Bookmark   March 29, 2011 at 9:22PM
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