Riding Mower Won't Start Without Jumping?
If your battery is good, then it is likely a failed voltage regulator. Take your battery to advance auto parts once charged fully. They will test it for free usually. (At least in Georgia.)
Using Bleach in a Small Wading Pool?
Install the free android app pool pal. Enter your pools gallons and get a test kit. Flawless. I use it with a 380 gallon pool.
