I’ve been using Ph-down for years. I use a Rival 4 qt. ceramic lined
crockpot. I usually put about 1 1/2- 2 qts. of water in it,. Then I
just pour the Ph out of the container right into the pot. If I had
to guess, I’d say I put about 1 cup of Ph in it. When I turn the pot
on I usually set it on low. When the liquid level gets low, I just
add more water.
I use ordinary tap water (ours is very hard, lots of calcium). I
don’t think the teflon coating is a problem unless the post is made
of a ferrous metal. If that’s the case, if the teflon gets a hole in
it & the metal the pot is made from is a ferrous metal you could get
a coppetr plating on any sterling items you put in the pot. Pickle
pots are better if they have a ceramic or glass lining.