algae and too low ph

[Danak]

I have the hth 6 way test kit when I test the CYA it reads 30 but can still see the black dot at the bottom of the test tube. Which makes me feel its too low. So I should add more bleach and at what rate? Another gallon and keep it there until the algae turns gray? Right now when I teat chlorine its dark yellow.

[Watermom]

This link my help. It shows you how to interpret off the scale OTO results:> http://pool9.net/oto-chart/

Also, this chart shows you how high chlorine levels need to be kept based on the CYA reading:> http://pool9.net/cl-cya/

For now, aim for keeping your chlorine between 12-15ppm. In your pool, each cup of 8.25% bleach will add about 1ppm and each quart will add about 4.5ppm. Use those as a reference to help you figure out doses of bleach to add when you test.

[PoolDoc]

These three images, snagged from Taylor's website illustrate correct CYA test interpretation:







Take your CYA reading AFTER you reach the end point.