increasing canister filter flow rate - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old 04-17-2020, 06:34 AM Thread Starter
Ras
Planted Tank Enthusiast
 
PTrader: (1/100%)
Join Date: Nov 2013
Location: NorCal
Posts: 537
increasing canister filter flow rate

I have a filter that came with 1/2" tubing but all the glassware I want is only for 3/4" tubing. I am wondering if splitting the inflow and outflow of the 3/4" tubing with something like this https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1 Giving me two outflows and two inflows. Would this decrease the drag and increase the flow rate?
Ras is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 04-17-2020, 07:42 AM
Planted Tank Guru
 
DaveKS's Avatar
 
PTrader: (0/0%)
Join Date: Apr 2019
Location: 67212
Posts: 2,106
No. Splitting in half will double (2 hoses instead of one) the volume/weight of water pump has to push up through the hoses, also, going to bigger diameter hose will also increase volume/weight of water pump has to push up the hoses. You’ll probably get about a 10% decrease in actual gph out of pump.


What is it your trying to fix? Usually splitting outputs and adding more jets in tank will help in eliminating dead spots in tank even though it cuts actual gph slightly. Good tank circulation is more about even dispersion around tank and creating complimentary circulation patterns around tank than it is actual GPH, most successful planted tanks will run great on 5-6x turnover rate if you design it logically. 3 100gph outputs around tank is twice as effective as one 400gph when you place those 3 outputs to work together to create a more effective circulation pattern in tank.

Example, put 100gph on ea of these 2 outputs so they work together to get water moving around tank in a circular pattern it will perform better than a single 300gph substantially. The one blowing down back wall right to left also would be better if it angled down so it swept along bottom and pushed debris and gases over to filter input (green circle). High->low circulation is needed to carry nutrients and gases to substrate layer.

DaveKS is online now  
post #3 of 9 (permalink) Old 04-17-2020, 08:38 AM Thread Starter
Ras
Planted Tank Enthusiast
 
PTrader: (1/100%)
Join Date: Nov 2013
Location: NorCal
Posts: 537
That makes sense. This isnt necessarily a circulation issue I just was worried I would be restricting flow by sizing down the tubes. My filter has an lcd panel that lets you control the output max being 795 gph and I am upgrading to a 60gal cube and wanted to make sure my filter would still be up to the job. At the moment i Have a shrimp guard over the intake and a glass inline co2 diffuser that are both slowing the water down significantly which is why I was thinking of ways to maintain flow w.o losing these two pieces.
Ras is offline  
 
post #4 of 9 (permalink) Old 04-17-2020, 08:49 AM
OVT
Carpe Diem
 
OVT's Avatar
 
PTrader: (144/100%)
Join Date: Nov 2011
Location: NorCal
Posts: 7,545
My 60g cube was just fine with a single 370 GPU filter with 5/8 tubing.
OVT is offline  
post #5 of 9 (permalink) Old 04-17-2020, 09:17 AM Thread Starter
Ras
Planted Tank Enthusiast
 
PTrader: (1/100%)
Join Date: Nov 2013
Location: NorCal
Posts: 537
Thanks guys, saved me a lot of money.
Ras is offline  
post #6 of 9 (permalink) Old 04-17-2020, 10:32 AM
Planted Tank Guru
 
DaveKS's Avatar
 
PTrader: (0/0%)
Join Date: Apr 2019
Location: 67212
Posts: 2,106
Quote:
Originally Posted by Ras View Post
That makes sense. This isnt necessarily a circulation issue I just was worried I would be restricting flow by sizing down the tubes. My filter has an lcd panel that lets you control the output max being 795 gph and I am upgrading to a 60gal cube and wanted to make sure my filter would still be up to the job. At the moment i Have a shrimp guard over the intake and a glass inline co2 diffuser that are both slowing the water down significantly which is why I was thinking of ways to maintain flow w.o losing these two pieces.
Im not following. You say filter has .5 out, but you want to split out to 2x 75 outs, not only are you going to bigger hose. You are doubling the # of hoses for pump to push against as well as increasing the volume inside both those hose by 33%. Both those factors will cut your GPH rate. That is not sizing down.
DaveKS is online now  
post #7 of 9 (permalink) Old 04-17-2020, 02:10 PM
Planted Tank Enthusiast
 
Bunsen Honeydew's Avatar
 
PTrader: (2/100%)
Join Date: Feb 2017
Location: Lindenhurst, IL
Posts: 603
Quote:
Originally Posted by DaveKS View Post
Im not following. You say filter has .5 out, but you want to split out to 2x 75 outs, not only are you going to bigger hose. You are doubling the # of hoses for pump to push against as well as increasing the volume inside both those hose by 33%. Both those factors will cut your GPH rate. That is not sizing down.
Wouldn't switching from 1/2 to 3/4 more than double the volume without a splitter?

Science, my lad, is made up of mistakes, but they are mistakes which it is useful to make, because they lead little by little to the truth. -Jules Verne
Bunsen Honeydew is online now  
post #8 of 9 (permalink) Old 04-17-2020, 05:25 PM Thread Starter
Ras
Planted Tank Enthusiast
 
PTrader: (1/100%)
Join Date: Nov 2013
Location: NorCal
Posts: 537
It was late when i wrote this. To be clear i went from 22mm (if i remember right ) tube to a 17mm
Ras is offline  
post #9 of 9 (permalink) Old 04-17-2020, 09:38 PM
Planted Tank Guru
 
DaveKS's Avatar
 
PTrader: (0/0%)
Join Date: Apr 2019
Location: 67212
Posts: 2,106
Quote:
Originally Posted by Bunsen Honeydew View Post
Wouldn't switching from 1/2 to 3/4 more than double the volume without a splitter?
yea, my bad, doing actual math instead of pulling it out of my head while posting the volume inside the hose will increase by 133%.

6ft of 17mm hose holds .42 liters
6ft of 22mm hose holds .70 liters
6ft is roughly 183cm

So by going to two 17mm hoses you are now pushing against .84ml of water instead of .7, a increase in volume of 33%, as well as increasing surface drag inside tubes. S youll still get a slight drop in total output.

Really the impeller size and speed and the exit port size of impeller housing are fixed, your never going to get a increase from that. A increase in length or diameter of hose, number of hoses and any increases in head height can only reduce the outflow from that pumps rated output.
DaveKS is online now  
Reply

Tags
None

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome