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Re: Aquatic Plants Digest V4 #1225

>Tom Wood wrote:
>> Ca (ppm)- 180 ppm TOTAL hardness, which isn't really "soft" per Tropica (see
>> below) but seems to work for me.

I think there is one more possible cause for confusion here: As TH/GH is measured it is the sum of Ca++ and Mg++ and possibly a little other polyvalent kations. In most Danish waters Ca and Mg comes in about equal parts. So 180 ppm Ca would equal (in Danish water) a litlle over 360 ppm TH/GH