RO-DI and WP-40 Question..Unrelated

Gunsnroses · 03/12/2014, 06:16 PM

My first question is about my RO-DI unit.
I am starting my saltwater mixing station and I want to gravity feed my RO-DI barrel. But to do this, I must elevate it above my other barrel which will put it close to the ceiling.
And I dont want my RODI unit up that high.
So will a Spectrapure unit pump water upwards of 3 feet?

Second question:
I have decided to purchase a pair of WP40's with a dual controller for my 180 gallon tank to use as flow, but I have just started my cycle with dry rock and sand and have nothing live in there.
How long can wait before I need to add that flow to my set up?

rmcaum · 03/12/2014, 07:21 PM

You need some kind of flow in your tank during the cycle to get the nutrients (ammonia) to all the holes in the rock. The flow from a return might be enough. As for the double contoller wps, I read a thread here where the cords connecting the pumps to the controller may not be long enough to put on opposite ends of a six foot tank. I have no experience, but you may want to check up on that. I love my two 25s but they are on separate controllers.
As for the spectrapure, it is pressure based. One psi equals about two foot of inches of water column. As long as you have 2 psi coming out the effluent side you should be fine for three feet. It may affect the efficiency of the membrane to have back pressure though, I am not an expert. My input is about 60 psi, I don't know what my effluent is.

Gunsnroses · 03/12/2014, 07:43 PM

I have a Diablo 10500 pump running through four 3/4 inch loc-lines. That gives me good surface agitation and some in tank flow.
And my input pressure on my RODI unit is around 80 to 85psi.

dkeller_nc · 03/13/2014, 07:30 AM

That's not the same as the output pressure, but you're still good. Atmospheric pressure is 14.696 psi, which is 33.8 feet of water. So even if you put 5 psig back-pressure on the membrane (which is negligible in terms of an RODI unit), you'd be able to deal with 11.5 feet of elevation change.

Fishyoga · 03/13/2014, 10:21 AM

An effective, albeit messy, way to check:
-hold you filtered output line at level with your RO/DI unit, pointing straight up
- if the stream of water reaches more than 3 feet in the air before it arcs over, then your output pressure is good

-Hold a small bucket up higher than the level that you plan to have your receiving container, hold your output line at the top of the buck. If it fills, then your pressure is good.

Lazy science it is, but you cannot argue with empirical evidence when you see it.

Fishyoga · 03/13/2014, 10:25 AM

Quote:

Originally Posted by Gunsnroses

My first question is about my RO-DI unit.
I am starting my saltwater mixing station and I want to gravity feed my RO-DI barrel. But to do this, I must elevate it above my other barrel which will put it close to the ceiling.
And I dont want my RODI unit up that high.
So will a Spectrapure unit pump water upwards of 3 feet?

Wait a minute... you want to gravity feed RODI into mixing station...
Is your output line from RODI still going to feed into RODI barrel, or were you asking because you want your RODI output line to reach your mixing station?

Or are you looking for pressure that will push RODI water out of your barrel, and into your mixing station?

danil · 03/13/2014, 11:13 AM

On your WP-40 question. Good to know they have dual controller... I didn't know that. I was hoping to hook mine to Apex one day. We will see. Just to let you know I tried to run WP40, WP25 and WP60 on my 180g in all possible combination and you might need more flow then two WP40. Though with dual controller you might be able to synch them more efficiently then I did.

Gunsnroses · 03/13/2014, 07:02 PM

Quote:

Originally Posted by Fishyoga

Wait a minute... you want to gravity feed RODI into mixing station...
Is your output line from RODI still going to feed into RODI barrel, or were you asking because you want your RODI output line to reach your mixing station?

Or are you looking for pressure that will push RODI water out of your barrel, and into your mixing station?

My RO-DI holding barrel will be above my saltwater mixing barrel.
And my RO-DI unit will be 3 feet below that barrel. So the output of
the RODI unit will need to travel about 3 feet to the opening of the RODI holding barrel.

I got an e-mail today from Spectrapure and they said as long as my water pressure is at least 50psi, then I could run my RODI water 30 feet straight up if I wanted to.
So since my water pressure is 80psi, and I only need for the water to flow 3 feet, then I am o.k. with no loss in efficiency

.

Gunsnroses · 03/13/2014, 07:04 PM

Quote:

Originally Posted by danil

Just to let you know I tried to run WP40, WP25 and WP60 on my 180g in all possible combination and you might need more flow then two WP40. Though with dual controller you might be able to synch them more efficiently then I did.

WOW!!! Its hard to believe that you needed that many pumps for a 180g.
I had read that some people had to dial back their pair of 40's cause they were creating sand dunes.
Guess I need to read a little more before I decide to buy.

03/12/2014, 06:16 PM	#1
Gunsnroses Registered Member Join Date: Nov 2013 Location: Pleasant View TN Posts: 421	RO-DI and WP-40 Question..Unrelated My first question is about my RO-DI unit. I am starting my saltwater mixing station and I want to gravity feed my RO-DI barrel. But to do this, I must elevate it above my other barrel which will put it close to the ceiling. And I dont want my RODI unit up that high. So will a Spectrapure unit pump water upwards of 3 feet? Second question: I have decided to purchase a pair of WP40's with a dual controller for my 180 gallon tank to use as flow, but I have just started my cycle with dry rock and sand and have nothing live in there. How long can wait before I need to add that flow to my set up? __________________ He who gets frustrated with freshwater tank, Never owned a Reef tank Current Tank Info: 180 gallon RR-75 gallon sump-50 gallon Refugium-RO Diablo DCS 200 Skimmer-Diablo 10500 and 5500 return pumps-Spectrapure MaxCap 90gpd

03/12/2014, 07:21 PM	#2
rmcaum Registered Member Join Date: Feb 2003 Location: Lexington Posts: 128	You need some kind of flow in your tank during the cycle to get the nutrients (ammonia) to all the holes in the rock. The flow from a return might be enough. As for the double contoller wps, I read a thread here where the cords connecting the pumps to the controller may not be long enough to put on opposite ends of a six foot tank. I have no experience, but you may want to check up on that. I love my two 25s but they are on separate controllers. As for the spectrapure, it is pressure based. One psi equals about two foot of inches of water column. As long as you have 2 psi coming out the effluent side you should be fine for three feet. It may affect the efficiency of the membrane to have back pressure though, I am not an expert. My input is about 60 psi, I don't know what my effluent is. __________________ -Bob Current Tank Info: standard 29 gallon, 65 gallon

03/12/2014, 07:43 PM	#3
Gunsnroses Registered Member Join Date: Nov 2013 Location: Pleasant View TN Posts: 421	I have a Diablo 10500 pump running through four 3/4 inch loc-lines. That gives me good surface agitation and some in tank flow. And my input pressure on my RODI unit is around 80 to 85psi. __________________ He who gets frustrated with freshwater tank, Never owned a Reef tank Current Tank Info: 180 gallon RR-75 gallon sump-50 gallon Refugium-RO Diablo DCS 200 Skimmer-Diablo 10500 and 5500 return pumps-Spectrapure MaxCap 90gpd

03/13/2014, 10:21 AM	#5
Fishyoga Registered Member Join Date: Feb 2014 Location: Alberta Posts: 136	An effective, albeit messy, way to check: -hold you filtered output line at level with your RO/DI unit, pointing straight up - if the stream of water reaches more than 3 feet in the air before it arcs over, then your output pressure is good -Hold a small bucket up higher than the level that you plan to have your receiving container, hold your output line at the top of the buck. If it fills, then your pressure is good. Lazy science it is, but you cannot argue with empirical evidence when you see it. __________________ 55 gallon, high output 4-lamp t5 fixture (actinic, purple, 2x white), 2 Ocellaris (Orange Peel, and Beedy), Yellow Watchman Goby (Yellow Dog), Diamond Goby (Donkey), Long Tentacle Anemone (Nebula), Sa Current Tank Info: 55 gal

03/13/2014, 07:30 AM	#4
dkeller_nc Registered Member Join Date: Mar 2013 Location: Central NC Posts: 5,062	That's not the same as the output pressure, but you're still good. Atmospheric pressure is 14.696 psi, which is 33.8 feet of water. So even if you put 5 psig back-pressure on the membrane (which is negligible in terms of an RODI unit), you'd be able to deal with 11.5 feet of elevation change.

03/13/2014, 11:13 AM	#7
danil Registered Member Join Date: Jan 2011 Location: Concord, CA Posts: 935	On your WP-40 question. Good to know they have dual controller... I didn't know that. I was hoping to hook mine to Apex one day. We will see. Just to let you know I tried to run WP40, WP25 and WP60 on my 180g in all possible combination and you might need more flow then two WP40. Though with dual controller you might be able to synch them more efficiently then I did.