Peter John Keating wrote:

> once the sodium hydroxide solution has cooled, add 5 gallons of
> concentrated "acide chlohydrique" to 45 gallons of caustic.  This brings the
> ph of 14 to ph 9.
> Once neutralised the solution can be poured onto the soil at an acceptable
> site.

Acide chlohydrique is probably HCl or Hydochloric Acid and is generally
used with Sodium Hydoxide as an example of a strong Acid- strong Base
reaction. The products are water and NaCl or table salt.

But the starting ingredients are nasty. And in those concentrations I
would pour very slowly and wear protective clothing and face protection.
To me, it is just not worth it both from a safety and economic
viewpoint.

Bill Truesdell
Bath, Me