Go Back   Aquarium Advice - Aquarium Forum Community > Saltwater and Reef > Saltwater & Reef - Getting Started
Click Here to Login

Join Aquarium Advice Today
Reply
 
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
 
Old 11-11-2003, 03:53 PM   #11
Aquarium Advice Freak
 
Join Date: Sep 2003
Location: Norcal
Posts: 438
technically all skimmers just sit there and churn the same water Is there a reason why sump based skimmers do better? Is it because of the water flow?
__________________

__________________
biotoxin is offline   Reply With Quote
Old 11-11-2003, 09:14 PM   #12
AA Team Emeritus
 
Join Date: Oct 2002
Location: Chatsworth, GA
Posts: 4,071
Send a message via Yahoo to loganj
I think the point that wseaton is making is that, with most HOB skimmers, the pump intake is so close to the skimmer output that a percentage of already skimmed water is being pulled back through the skimmer. I think this depends a lot on the currents in the tank though. Also, a surface skimmer makes an unbelievable difference in the efficiency of any HOB skimmer. You can also locate the pump/powerhead away from the skimmer. The reason a sump skimmer does a better job is that it receives a fresh supply of water that has been skimmed from the surface of the tank. It also, in most cases, dumps the skimmed water into an area of the sump where it will not be recirculated through the skimmer.
On the subject of skimmer efficiency, the dwell time of the bubbles is what makes the skimmer efficient. The V-8 Chevy powered skimmer was a joke of course. If you are forcing water through the skimmer at such a high rate that the DOC coated water molecules are not contacting the rising bubbles, then your efficiency will drop. What you want is a stream of microbubbles rising slowly through a downward flow of water. This lets the water molecules collide with the bubbles and shed the attached DOC's. This is why counter-current skimmers work so well...bubbles always going up....water always going down. Co-current skimmers have the water and bubbles going in the same direction thus reducing the contact time considerably. Verturi skimmers are like super charged co-current skimmers in the way they function. Most of the good ones have a double or triple pass system that gives you a degree of counter-current effect as well as the initial co-current effect. I hope this makes at least some sense. If not, I can suggest reading (I think...can't find the darn thing right now) "Aquatic Systems Engineering" by P. R. Escobal. After you read it, you'll really be confused
__________________

__________________
Life is not measured by the number of breaths we take, but by the moments that take our breath away.
Logan J
loganj is offline   Reply With Quote
Old 11-12-2003, 09:10 PM   #13
Aquarium Advice Freak
 
Join Date: Jul 2003
Location: Coral Springs, FL
Posts: 217
Send a message via MSN to astride13
I do not use a skimmer on my tank. My Ammonia and Nitrites test at 0ppm and my Nitrates always test below 5ppm without water changes. I use strictly biological filtration (dsb+fuge).

Corals such as goniopora live in high nutrient waters that are rarely clear. Also, some species of Xenia are commonly found where sewer is released into the ocean. On the other hand, corals that get most of their nutrients from light prefer extremely clear water. It is a matter of making your "environment" the same as your inhabitants are use to. (and I don't mean to use sewer as topoff )
__________________
Adrian
astride13 is offline   Reply With Quote
Old 11-13-2003, 01:29 AM   #14
Aquarium Advice Activist
 
Join Date: Sep 2003
Location: grand rapids mi
Posts: 143
Quote:
the pump intake is so close to the skimmer output that a percentage of already skimmed water is being pulled back through the skimmer
Yes....exactly. The in-sump skimmer would take advantage of the fact that *most* sump configurations are designed to have efficient out-flow/inflow without too much over-lap. So, the problem solves itself.

This gets us into the side issue of waterflow in a tank and one of my peeve's that I think a lot of reefers have too many powerheads (horizontal circulation) vs vertical water circulation. I tend to use more back filters for water movement simply because the large models move a huge volume of water from the surface to the bottom of the tank with low velocity.
__________________

__________________
wseaton is offline   Reply With Quote
Reply

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Reef shade structures almost a reality flanque Aquaria Off-Topic 3 02-03-2006 05:24 PM
Reef shade structures almost a reality flanque Aquaria Off-Topic 3 02-03-2006 10:27 AM
The best set-up you have owned?(both in reality and fantasy) ConanTheLibraia Freshwater & Brackish - General Discussion 10 08-12-2005 04:09 PM
We need to accept reality alarmguy66 Saltwater Reef Aquaria 2 01-15-2004 10:29 PM







» Photo Contest Winners








Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 07:20 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.