Changing Carbon Medium

ggrowney

AC Members
Apr 8, 2006
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My filter medium is bagged carbon along with ceramic balls and rubber. The manual recommends changing the carbon monthly. Won't this cause an ammonia spike every time?
 
Carbon works as a mechanichal and chemichal filter medium, but after a short time it becomes clogged and stops working. You might want to replace it every month. This will not necesaruilly mean an amonnia spike, since you also have other filtration material thet hold bacteria as well.

But, you might consider stop using carbon. It works for a very limited period of time, and unless you have something ugly in the water, you don't need it. Most people use it only to remove medicines left after a treatment, ot to remove tannins leached into the water by driftwood.
 
I use carbon in all my tanks, all the time, except during rare periods where I need medicines. I change it out weekly, without fail. I feel the clarity it gives to the water is unsurpassed, IMO.
 
Well, we can only replicate nature so much. A river environment, for example, is continuously refreshed with new water while our tanks are not. The carbon filtering helps keep the water a bit cleaner so we don't need to change it so often.

Of course, your mileage may vary.
 
It all depends on how much stuff is in your water. Carbon also acts as a great bio medium. Carbon will often last for only a week or two, but it can last a month. I don't use carbon and my water is fine. IMO most of the ammonia eating bacteria are in the tank itself. I have completely changed filters (not just media, but whole hob filters) with no ammonia spike.
 
I don't use carbon. haven't for over a year. i only use carbon to remove medication.
 
born2lovefish said:
I understand that, but carbon does not take everything out of the water. And if you do not change it after it goes bad, which you have no way of knowing when it does go bad, the cardon will just release everything back into the water.

It doesn't magically release everything at once the moment it is finished, it just stops absorbing any more. It takes quite some time to degrade and slowy release what it held.
 
Carbon makes a good (very) short term chemical filter. It doesn't last a month, it doesn't last a week or two: it lasts a few days at best. It doesn't degrade slowly over time. It doesn't leach nasties back into the water column.

It removes certain chemicals and leaves others behind. Good for removing medicines, also removes fertilizers (if you're planted). Doesn't remove the need for water changes (and is generally a lot more expensive than fresh water).

It does make a nice mechanical filter and a nice biofilter after the chemical filter has filled up (think 48-72 hours). No harm in leaving it be. If you want to have steady chemical filtration you'd need, like rbishop, to change it out weekly, if not more often.

Changing it shouldn't result in an ammonia spike: if it does you've got other problems.

I more or less never use it (and am very happy with the clarity of the water).
 
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