Wiki states that:

1. Stone Hedge has 90 soak.

2. Formula for damage is "sqrt(phlegm*1k / 10k) * 10" (so "sqrt(phlegm / 10) * 10")

3. "You will need at least 90-100 phlegm to destroy a segment of a stone hedge"

100 phlegm dmg: sqrt(100/10)*10 = ~31.6 (which is a lot lower than 90 soak)

According to that formula, in order to beat 90 soak, one will need more than 810 phelgm.

So what is actually wrong on wiki: the soak or the formula? Or am I missing something?