Heh!

The larger bottle is why I asked. I'm in process of putting in a refill order and discovered that my favorite online vendor carries the R-0004 in the 2 oz bottle but not the R-0014. In fact, I'm having no luck finding a 2 oz size of R-0014 anywhere.

No big deal, I can always pick it up at Leslie's down the road.

One year I bought Phenol Red from the pool store where I get my chlorinating liquid. It was the HTH brand. Though my test turned into an interesting shade of mauve I couldn't match it to the color chip on my little comparator. I know where the pH of my water should be, so I started playing around with different numbers of drops. As it turned out, this particular brand of Phenol Red produced believable results with 3 drops rather than five.

I guess it's kinda like cooking: you can substitute with potassium chloride but it's not ever going to taste as good as using real salt.