conductivity. Nearly all tds pens are really just ec pens - so this is sort of like a tds of 10 1/2. Very soft water.Beautiful. What does ec 21 stand for?
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conductivity. Nearly all tds pens are really just ec pens - so this is sort of like a tds of 10 1/2. Very soft water.Beautiful. What does ec 21 stand for?
Nope but they sure do head butt a lot.What is the evolutionary advantage of having the hump on the head? Any ideas?