This was my procedure yesterday, and is what
S
skjl47
is explaining in above post.
Yesterday I cleaned 1 of 2 Fx6 filters on my 180 gallon.
One filter I took outside and sprayed off casing, bio-media ( they were getting very layered with mulm) and hoses. The sponges I rinsed and squeezed in dechlorinated water because I had replaced all my sponges in this filter three months ago.
I know I have diminished my bio-filters capacity temporarily; however, I am not concerned because the nitrifying bacteria will reestablish itself very quickly.
Over the next week, instead of 1- 60% water change, I will do 2.
The other filter will be cleaned in a month, I rotate them ( every three months) so as I always have the other to repopulate the other with bacteria that has been cleaned. What I have deduced from this is that the bacteria rebuilds itself rather quickly. My unscientific guess is in about 72-96 hours.
What I have learned from RD from this exchange is that at certain times of the year chlorine levels are different- higher and lower. Also, that the above procedure has many variables that, well, vary.
Maybe everyone else reading this already knew of the varying chlorine levels in tap-- It was something I had never considered. I am a very unscientific person, water chemistry is understood by me through my 30 years of fish-keeping. It is more by "feel." I have enough experience to know all the balls I have to have in the air to never put my delicate, wild fish i danger. This could be, however, a recipe for disaster for those who have not yet developed the experience or "feel" for fish-keeping needed to keep all these "balls in the air," so to speak. But, it can be done- I routinely do it, like I said, for many years.
* I know my nitrifying bacteria will be put back by my cleaning procedure.
* I know that it will rebuild within a week.
* I know that I have to have 2 filters or some bacteria unexposed from cleaning that will repopulate the cleaned media.
This is not for beginners because it doesn't have a "one size fits all set of procedures."
It is not a "better" method. It is a method. It works for me.