One of the lone KZ products that I did not like By Subodh on 11/28/2013Subodh wouldn't recommend this product to a friendanything between 350 or 400 looks the same. At 400, algae goes crazy. At 350, you're already way too low. Buy yourself a Salifert K test kit and save the trouble.
View Larger Map 6325 Sandburg Road, Suite 400, Golden Valley, MN 55427