Chemi Pure Elite is a great product. For my cyano what I did

Bought Chemi Clean - Product specifically designed for Cyano. Treated to specifications on box.
Did water change after treating with Chemi Clean and added Chemi Pure Elite.
During the treatment of Chemi Clean- you have to remove all carbon, Chemi Pure and turn off skimmer to let it do its job. After treating I noticed a big iffernce.

Key to it working is following directions.