<a href=showthread.php?s=&postid=9368061#post9368061 target=_blank>Originally posted</a> by steve the plumb
Goodwin I wanted to ask before (I asked before) on those sand filters.I had always thought about getting one.Do they clog up?I was wondering if they can cause a rise in nitrates if they do clog.Do they become exausted like a sandbed.I see you use them in all your tanks.Since I never used one what are the pluses and minuses.I am looking to start a 300 gal tank with a 100 gal sump and since you seem to have had great sucess on all your tanks I would think it might be a good investment.Thanks very nice tank.I wish I could afford one like it.
Steve...Good question, part of it I can answer. The sand filter don't clog unless you stop the flow going to them for a period of time. I believe that my stable water quality is due in part to these filters. I've never had a problem with them. I was asked the following question on another forum:
what do you mean by good luck with your sand filters?
sand filters are good at nitrification, that is reducing ammonia to nitrate but does nothing for denitrification, the conversion of nitrate to nitrogen gas which is offgassed. they can lead to a build up of nitrate in your tank. not good for SPS corals. what have your nitrate levels been in your other tanks?
My nitrates have always been next to zero, but he asked a good question, so I went to my tank builder for his thoughts about the sand filters.
This is the reply I got from Franz Metzger, owner of The Aquarium Company in Winthrop, MN.
"That would be true if sand were the only filter you were running. Its not so it really doesn't apply.
In all of the aquariums that we run with a refugium and liverock on, our Nitrates have been zero. Even on our wet/dry systems with the reticulated foam and liverock in the sump, zero. After 10-12 years, zero. The denitrafication cycle is a transgression from the most deadly components, ammonia to less lethal nitrite to further less lethal nitrate and I have found Nitrate handled with the system itself. None of the filtration is working at even close to its potential. The redundancies are there for you need them to avoid the spikes.
If you think about it, the sand filters and all aerobic filtration can only produce Nitrate because they are converting even more toxic ammonia. If you have Nitrate, it is converted ammonia and while Nitrate may not be great for SPS, ammonia will kill them quicker.
The protein skimmer is such a great filter because it is removing protein even before it can decay into ammonia, completely skipping past the nitrogen cycle. That is why you hear of people running a reef with just a skimmer. Not my idea of the perfect system. If there ever comes an event in the aquarium however that overpowers the skimmer, it's essential to have the back up.
Ammonia itself can be stripped as a gas, also skipping the rest of the nitrogen cycle. That is where the bioball was born as a diffusion device that should be counter flowed with air in a tower to strip ammonia gas. It has been turned into something far less effective however and used as a biological culture bed."
I have to admit, I never did very well in science in school, so I am relying on what others have told me. I wouldn't have a tank without one. They are relatively inexpensive when compared to other components in the system. I'm running 2 FB600 filters on my new tank and I think that they were $80 apiece. One would easily handle your system.
I hope this answers your question.