Go Back   Aquarium Advice - Aquarium Forum Community > Freshwater > Freshwater & Brackish - General Discussion
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 07-23-2013, 01:41 AM   #1
Aquarium Advice FINatic
 
Patrice's Avatar
 
Join Date: Jun 2011
Location: quebec, mirabel
Posts: 505
Calculating and measuring true gph

I got 2 differents external pumps that are very close in gph. One is a fluval 204 and the other is a fluval 303.

So i tested the time it take to fill up a 4 gallon bucket.
No media, just the filters. I just need to know how to calculated the gph? I got 2.8 min on the fluval 303, and 5.3 min on the fluval 204. Now on they official manuel, the 303 is 177 gph and the 204 is 180 gph. And i am pretty sure that's not the true gph.

Click image for larger version

Name:	ForumRunner_20130723_014008.jpg
Views:	54
Size:	61.8 KB
ID:	187814
__________________

__________________
Patrice is offline   Reply With Quote
Old 07-23-2013, 02:08 AM   #2
Aquarium Advice Addict
 
Mebbid's Avatar

POTM Champion
 
Join Date: Mar 2013
Location: Michigan USA
Posts: 12,625
They don't factor in the head loss of the pump I would assume. The higher the filter has to pump the water then the slower it is going to pump it. Try raising the bucket up another foot and see what the flow difference is.

Also, most canister filters work by being gravity fed by the tank. Try raising the tank you are pumping the water from to an average aquarium height.
__________________

__________________
Mebbid is offline   Reply With Quote
Old 07-23-2013, 12:06 PM   #3
Aquarium Advice FINatic
 
Patrice's Avatar
 
Join Date: Jun 2011
Location: quebec, mirabel
Posts: 505
You may be right, i wont do it because its hard work. Lol. I install the the stronger one. There a big difference between the 2 even if its not the right way
__________________
Patrice is offline   Reply With Quote
Old 07-23-2013, 07:46 PM   #4
Aquarium Advice Addict
Community Moderator
 
aqua_chem's Avatar


 
Join Date: Jul 2011
Location: Baltimore, MD
Posts: 6,936
1) Do you know how water one of those buckets holds? Some hold closer to 5 gallons, which will throw off your numbers.

2) Canister filters have no head height under normal circumstances. The pump only moves water; it doesn't push or pull it. As mebbid said, this is not the proper use of a canister filter, so the numbers would probably be quite a bit less.
__________________
Algae creates 75% of the world's oxygen, so really we're all just doing our parts...
aqua_chem is offline   Reply With Quote
Old 07-23-2013, 08:05 PM   #5
Aquarium Advice FINatic
 
Patrice's Avatar
 
Join Date: Jun 2011
Location: quebec, mirabel
Posts: 505
Thanks, now i know. And yes i have a line in the bucket.
__________________
Patrice 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








» Photo Contest Winners







All times are GMT -4. The time now is 01:28 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.