When ammonia is in the water there are 2 points to pay attention to:

1. The flow can’t be bigger than 10m/h. So when selected the correct vessel always check the maximum flow that can go over the media bed.

Example:

Flow = surface circle (vessel) * velocity
Example; 10m/h in a 99l CR (14”65”)
14*2,54= 35,56 cm2 (diameter)/2 = 17,78 cm2
Pi * (r*r)= pi * (17,78*17,78)= 992,64 cm2 = 0,0992 m2
Flow = 0,0992 m2 * 10m/h = 0,9 m3/h

2. The pH can’t be bigger than 8.3!

Otherwise the chance is big that ammonia will be ammoniac (NH₃) and CR only removes Ammonia (NH₄⁺)