Hi. This morning (my morning) one of my mentors gave me advice on how to flush the nitrogen toxicity out of my los. He said between 2 - 3 times the volume of the pot. If the pot is 20 L must I put 40 L through? I didn't get to ask him in time because we are in different time zones... nod to @InTheShed sorry for not asking earlier. The difficulty is getting hold of 40 L of dechlorinated water. So far I have poured through 7.5 L.... @Roy Growin , are you around atm... I'm pretty certain you know the answer to this?