My name is John Browne and I am a partner Roof-A-Cide.

Here, we typically run a 50/50 ratio of glycol/water in the lines.

Nicely acid stained is 6 to 10 per foot so I would not go there.

there is a glycol solution the HVAC can put in the boiler system , it will greatly reduce the freezing point of the water , protecting the pipes and radiators below freezing .MOST reasonable people realize that water freezes when its cold , the frozen pipes were caused by the tenants not having fuel to run the furnace , Damage caused by tenant neglect or abuse should be paid by them

During that time, she applied boric acid and DE on the tunnels daily, and around the house weekly.

There was one more ingredient- Maybe muriatic acid, bleach or something like that.

I have done this before mostly by acident when one old thread gets revived.

He strips the tub down with acid and will fill in any imperfections with fiberglass.

It comes down to how much stomach acid you are willing to tolerate. 

We used gel baits, IGR (insect growth regulators), diatomaceous earth, and boric acid to get rid of them -- haven't seen any more of them in more than a year -- not sure how long they had been there.