Harvey,
To find out if your test strips are accurate, send a sample of your water to the Texas A&M soil sciences lab for an independent test. Compare their results to yours, and you will see how accurate yours is.
Southern Excellence is a fertilizer, sold by a company in Alabama. They advertise in Pond Boss.
Double check your water chemistry, then talk about fertilizer. Tell us your results after the A&M lab tests it. By the way, your county agent has a form to fill out and send with the sample.
