Sep 23, 2002, 6:19 AM
Post #22 of 49
Good afternoon Dr Tan
Re: [dttk] Why call dry/wet if dry is better?
[In reply to]
Thanks for your input! I am still puzzled by the principles behind the workings of a TT filter actually. It's good that we are having a discussion on this. I have been stumped by some of the questions posed by friends, forum members etc. All I know is that it works!
I'm sure you're right in that it takes more than oxygen to remove the nitrates but I did remember reading somewhere that O2 plays a vital role in assisting the conversion of the nitrates into nitrous oxide.
Seems like I have more questions than answers now!
1. We say that the slower the trickle the more effective the TT filter is. But if the trickle is slow, doesn't it mean that the bio-media doesn't have the chance of getting wet. Water just trickles pass and the media will not get really wet, hence how will the bugs survive? Even as both Dr Tan and Stuart have the trickle well spread out, but due to the slow trickle, I'm not sure if the bacs. survive there well.
2. Eddie Lee posed me this question which stumped me. "If you had a very large pond like say, Dr Tan's, assuming there are lots of nitrates in the pond, how will a small TT filter running at such a slow trickle be able to convert all the nitrates and how long does it take for the water to run through entirely once by the TT's pump? I didn't know how to answer that!
3. If I remember correctly, Mark Richman did some tests on this and his conclusion was that height and the slower trickle do make a difference to the results.
I too have the same thoughts like Dr Tan and Stuart, but wanted to push this discussion into a different realm by inviting more views on this. Anyone care to contribute their thoughts?