I looked up Borax - as long as it is for simple household cleaning it seems to be ok, but too much can harm the biological activity in the tank. If borax is sprinkled on soil it kills plants and not much will grow back until it eventually washes away. You can buy a big box of Boraxo borax for a couple of dollars. (Twenty Mule Team is still around!)

Biz. It was one of the very first enzyme products I remember being advertised in the US.

This afternoon I visited a couple of stores and wasn't able to find Ball's Pickle Crisp in stock. Maybe everyone in North Texas is making pickles right now and has cleared out the stores. I have an 11-year-old jar that is caked so hard I have to chip at it to get any to use. It's time for a new one and I had to order it on Amazon. It's granules of calcium chloride. I also had to try a couple of places to get a few ounces of dill seed, but did get some. Again for pickles.