Here’s a party trick. Red cabbage juice is a natural pH indicator. Boil some purple cabbage. Strain it. You get purple water that’s basically a mood ring.
Add lemon juice. It turns pink. Add baking soda. It turns green. You can test your pool with salad ingredients. That’s not science—that’s magic.
I once tested the water in a muddy puddle. pH 6.2. That puddle was healthier than my friend’s coffee. Nature is a comedian.
