水草情迷

小弟剛買了一支 API 既 GH KH 硬度 測試劑
但看不明白說明書怎用
請各位師兄 教一教~~請講解一下怎用
我看不明白他的 gh & kh conversion chart
以下這些 不明白
# of drops , °dkh , ppm gh/kh
1 , 1 , 17.9
2 , 2 , 35.8
3 , 3 , 53.7
等等..... 去到 12 的

This means:
1 drop = 1dKH or 17.9 ppm of CaCO3 dissolved in the water;
2 drops = 2 dkH or 35.8 ppm of CaCO3 dissolved in the water;
3 drops = ditto

dKH is a German measure whereas ppm (parts-per-measure) is a metric measure.

More info:
http://www.thekrib.com/Plants/CO2/hardn ... frank.html