I bought pH DOWN in grandular form online.

pH Down Dry, acid 1.5 lbs, 1 @ $11.95 each.

Bought from www.insidesun.com

I bought a small bag....about the size of a two packs of cigarettes.

The bag too will last for fricking years.

Just a fricking pinch of the shit will take a half gallon jug of tap water from pH 10.8 to 6.8.

I mean just a pinch!

Very corrosive stuff....in fact the razor blade I use to scoop it out of the bag with is all rusted and corroded now.

Like I said the bag I bought will last for many many years.

Even now that I do the 5 gallon water jugs....to adjust the pH down to 6.8 or so, all I need is may 1/4 teaspoon.