No Chlorine-Nitrates in water?

shamoil · Postby **shamoil** » Wed 30 Jul, 2014 00:13

This is an important information. I have got more ideas from your post. Thanks

Postby **chem geek** » Wed 30 Jul, 2014 02:16

Your CYA may be far higher than 45 ppm if you are using Trichlor pucks. Also, a DPD test can bleach out from high chlorine levels. You should get your own proper test kit -- either the Taylor K-2006 or the TFTestkits TF-100 so you can know the truth about your levels. Existing algae can be killed with chlorine if you raise and maintain an FC that is 40% of the CYA level, but after the algae gone you have to maintain a minimum FC that is 7.5% of the CYA level. See Defeating Algae.