Rena Filstar GPH

AJ_Wave · 01-24-2004, 08:09 PM

Are the published Rena Filstar GPH correct or is this the GPH with no media?

I ask because my Double Helix UV needs between 100 and 200 GPH to work effectivly. The XP1 pumps 250 GPH and the XP2 pumps 300 GPH. I know I've heard this debated and discussed but if I recall only Eheim is publishing GPH with media.

If the XP1 is really moving 250 GPH I would not be able to use this with my UV.

Rex Grigg · 01-24-2004, 08:43 PM

It's the rated volume the pump can handle at no head and with no media in the filter.

AJ_Wave · 01-24-2004, 08:56 PM

So with media what would you "guess" it's outputing?

m.lemay · 01-25-2004, 02:23 AM

The XP1 would output right around the range your looking for

malkore · 01-25-2004, 01:52 PM

Rex, what does 'at no head' mean?

AJ_Wave · 01-25-2004, 02:15 PM

Quote:

The XP1 would output right around the range your looking for

How about the XP2? To much?

Reason I ask is the XP2 is only $20 more and has 2 media baskets. But if the flow rate with media is to high I defeat the purpose of my UV.

Only other option I see is to T off the flow just before the UV and allow some of the water to bypass the UV into another T right after the UV???

Thanks

m.lemay · 01-25-2004, 02:57 PM

I'd get the XP2 simply because you get an extra media basket. Theres a butterfly valve that comes with it that you can use to slow down the flow a little or you can tee it off like you said. You may not need to do either, but at least you have the options.

Marcel

Aftica · 01-25-2004, 03:40 PM

Gregg - at no head means the pump has no hose attached and is not pumping upwards....

Picture a pump on the floor and the top of your tank is 5 feet of the floor then the pump is got 5 feet of head to pump... it's not a technical explanation but..... that's as good as I can get

When buying pumps many list the head ratings on them... usually in a small spreadsheet.. so many gallons at so many feet of head etc...

Wasserpest · 01-25-2004, 03:51 PM

Keep in mind that "head" means very different things for powerheads and canister filters. Powerheads which can be used to pump water out of a sump, or up a waterfall, bear the full weight of the water. Canister filters are closed systems, the inflowing water equalizes the pressure of the outflowing water. If you turn them off the water just stops flowing, but they don't have to push it up a few feet against gravity. Thats why you don't see ratings on canister filters "at 3 feet head" etc.

Rex Grigg · 01-25-2004, 04:22 PM

Head is the distance the pump must lift the water.

cruizer · 01-25-2004, 04:34 PM

No, head is not the distance that the pump must lift the water.
Head is almost like resistance. It is based on flow velocity, the fluid used, the temp of the fluid, and the coefficent of friction of the object the liquid is running through. (I work in the hot water industry, I design radiantly heated floors). 0 ft of head usually occurs when the water leave the pump immediately direct to the open. You can have 10 ft of head after having 130 deg water running through 280 ft of pipe. Doesn't matter if it goes straight up 5 ft or 50 ft.

Sorry, it's the only technical data i've been able to contribute to this board.

Rex Grigg · 01-26-2004, 01:53 AM

You are correct. But for this application head is the distance we are raising the water.

pedietz · 01-26-2004, 02:36 AM

People say that putting a DIY CO2 reactor on the output side of the Rena Filster loses a lot of water "umphh"...

So if the larger XP flow is too strong, adding the CO2 reactor may be just the thing needed...

01-24-2004, 08:09 PM	#1
AJ_Wave Algae Grower (View User Tanks) PTrader: (-1/0%) Join Date: Jan 2004 Location: Atlanta, GA Posts: 87	Are the published Rena Filstar GPH correct or is this the GPH with no media? I ask because my Double Helix UV needs between 100 and 200 GPH to work effectivly. The XP1 pumps 250 GPH and the XP2 pumps 300 GPH. I know I've heard this debated and discussed but if I recall only Eheim is publishing GPH with media. If the XP1 is really moving 250 GPH I would not be able to use this with my UV. __________________ AJ ■ Oceanic 30G Cube ■ Filstar XP2 ■ CSL Power Compact with Moon ■ Hagen CO2

01-24-2004, 08:56 PM	#3
AJ_Wave Algae Grower (View User Tanks) PTrader: (-1/0%) Join Date: Jan 2004 Location: Atlanta, GA Posts: 87	So with media what would you "guess" it's outputing? __________________ AJ ■ Oceanic 30G Cube ■ Filstar XP2 ■ CSL Power Compact with Moon ■ Hagen CO2

01-25-2004, 02:23 AM	#4
m.lemay Planted Tank Guru (View User Tanks) PTrader: (9/100%) Join Date: Jul 2002 Location: Naugatuck, CT. Posts: 2,647	The XP1 would output right around the range your looking for __________________ FILSTAR Pimp #2 75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.

01-25-2004, 01:52 PM	#5
malkore Planted Tank Guru (View User Tanks) PTrader: (0/0%) Join Date: Nov 2003 Location: Lincoln, NE Posts: 2,165	Rex, what does 'at no head' mean? __________________ Malkore Filstar XP2 PIMP #3 Visit my aquarium pages - see specs on my tanks, and photos of how they've evolved

01-25-2004, 02:57 PM	#7
m.lemay Planted Tank Guru (View User Tanks) PTrader: (9/100%) Join Date: Jul 2002 Location: Naugatuck, CT. Posts: 2,647	I'd get the XP2 simply because you get an extra media basket. Theres a butterfly valve that comes with it that you can use to slow down the flow a little or you can tee it off like you said. You may not need to do either, but at least you have the options. Marcel __________________ FILSTAR Pimp #2 75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.

01-24-2004, 08:43 PM	#2
Rex Grigg Planted Tank Guru (View User Tanks) PTrader: (65/100%) Join Date: Dec 2002 Location: Portland Orygun Posts: 9,600	It's the rated volume the pump can handle at no head and with no media in the filter.

01-25-2004, 03:40 PM	#8
Aftica Planted Tank Obsessed (View User Tanks) PTrader: (1/100%) Join Date: Nov 2003 Location: Newfoundland, Canada Posts: 356	Gregg - at no head means the pump has no hose attached and is not pumping upwards.... Picture a pump on the floor and the top of your tank is 5 feet of the floor then the pump is got 5 feet of head to pump... it's not a technical explanation but..... that's as good as I can get When buying pumps many list the head ratings on them... usually in a small spreadsheet.. so many gallons at so many feet of head etc... __________________ Another Flaming Toy I Cannot Afford! Pimp Member # 112 Afticas DIY-Hood Planted-Tank Adventures.html

01-25-2004, 03:51 PM	#9
Wasserpest Are these real? (View User Tanks) PTrader: (140/100%) Join Date: Jun 2003 Location: Monterey, CA Posts: 14,646	Keep in mind that "head" means very different things for powerheads and canister filters. Powerheads which can be used to pump water out of a sump, or up a waterfall, bear the full weight of the water. Canister filters are closed systems, the inflowing water equalizes the pressure of the outflowing water. If you turn them off the water just stops flowing, but they don't have to push it up a few feet against gravity. Thats why you don't see ratings on canister filters "at 3 feet head" etc. __________________ All my tanks Autodosing Water Change Temperature Monitoring Cheap Filter The Wasser-Controller

01-25-2004, 04:22 PM	#10
Rex Grigg Planted Tank Guru (View User Tanks) PTrader: (65/100%) Join Date: Dec 2002 Location: Portland Orygun Posts: 9,600	Head is the distance the pump must lift the water.

01-25-2004, 04:34 PM	#11
cruizer Planted Member (View User Tanks) PTrader: (1/100%) Join Date: Jan 2004 Location: Valparaiso, IN Posts: 173	No, head is not the distance that the pump must lift the water. Head is almost like resistance. It is based on flow velocity, the fluid used, the temp of the fluid, and the coefficent of friction of the object the liquid is running through. (I work in the hot water industry, I design radiantly heated floors). 0 ft of head usually occurs when the water leave the pump immediately direct to the open. You can have 10 ft of head after having 130 deg water running through 280 ft of pipe. Doesn't matter if it goes straight up 5 ft or 50 ft. Sorry, it's the only technical data i've been able to contribute to this board. __________________ Check out my AquariBlog for tank progress and updates!

01-26-2004, 01:53 AM	#12
Rex Grigg Planted Tank Guru (View User Tanks) PTrader: (65/100%) Join Date: Dec 2002 Location: Portland Orygun Posts: 9,600	You are correct. But for this application head is the distance we are raising the water.

01-26-2004, 02:36 AM	#13
pedietz Planted Member (View User Tanks) PTrader: (0/0%) Join Date: Dec 2003 Location: Nebraska Posts: 188	People say that putting a DIY CO2 reactor on the output side of the Rena Filster loses a lot of water "umphh"... So if the larger XP flow is too strong, adding the CO2 reactor may be just the thing needed...

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