All times are UTC + 8 hours




Post new topic Reply to topic  [ 11 posts ] 
Author Message
 Post subject: slo.
PostPosted: Oct 6th, '18, 23:45 
Offline
Valued Contributor
Valued Contributor

Joined: Jan 31st, '18, 03:06
Posts: 86
Gender: Male
Are you human?: Yes
Location: Canary islands, spain
i am trying to understand how slo,s work. I have watched rob bob,s video, watched nathan,s video(which is a different model of slo),read what i can find on this site and elsewhere.
<what i don't understand is, how does the water flow up, lifting the fish poo with it? some bloggers use airpumps in the slo tube to get the water moving. What are the dimensions(pipe width, ft depth, pump pwer you would need to take into account of for the slo to work?


Top
 Profile  
Reply with quote  
    Advertisement
 
 Post subject: Re: slo.
PostPosted: Oct 6th, '18, 23:46 
Offline
Valued Contributor
Valued Contributor

Joined: Jan 31st, '18, 03:06
Posts: 86
Gender: Male
Are you human?: Yes
Location: Canary islands, spain
sorry, I hit the send button twice


Top
 Profile  
Reply with quote  
 Post subject: Re: slo.
PostPosted: Oct 7th, '18, 06:54 
Offline
Site Admin
Site Admin
User avatar

Joined: Mar 12th, '06, 07:56
Posts: 17737
Images: 4
Location: Perth
Gender: Male
Blog: View Blog (1)
You wait till you try and wrap your head around siphons. :support: :lol:

SLO is easy.. there's a hole in the side of your tank, as the water level rises, water flows out of the hole, gravity and air pressure I guess is causing that to happen, or is it just gravity, water always wants to flow to the lowest point. Now imagine putting a small section of pipe into the the hole, perhaps just a fitting, water will still flow out the hole/pipe as you try to put more water into the tank.. Now you could add more pipe to the hole, extending the pipe all the way down near the bottom of the tank, as you add more water to the tank, water will always try to flow to the lowest point, through the pipe and out the hole. The pressure of gravity pushing down on the water in the tank forces water out the hole.

Pipe sizes, well that depends on how much water is flowing into the tank, you want the water flowing out to be equal to the water flowing in, if the pipe out/SLO is too small it wont keep up and the tank will fill and over flow. So the outlet pipe needs to be big enough to let the water flow out at the same rate as it's flowing in.. You could make it huge and it will always flow out slowly as the water level tries to rise, but if you make the pipe a bit smaller the speed of the water in the pipe gets faster. Fast flowing water can move solids in suspension where as slow flowing water causes solids to drop out of the water flow.

So you want the size of the pipe to be just large enough to keep up with the flow coming into the tank yet small enough to keep the velocity of the water at a decent rate to move the solids..

I'm not sure if I'm making this sound even more complicated.. lol It just works, and generally if you post details about your system and pump capacity, someone will be able to give you an idea of the size SLO piping you need.

_________________
www.havehomewilltravel.com
Life on the road


Top
 Profile Personal album  
Reply with quote  
 Post subject: Re: slo.
PostPosted: Oct 7th, '18, 06:56 
Offline
In need of a life
In need of a life
User avatar

Joined: Jan 24th, '13, 08:01
Posts: 1534
Gender: Male
Are you human?: Sometimes
Location: Australia, Victoria, Northern Suburbs
Hi Shaunohara,

A SLO is just an overflow, instead of your fish tank overflowing from the top of the tank it overflows from the bottom of the tank.

If you had no outlet or overflow at all on your tank and you pumped in water at 1,000 litres an hour, your tank would overflow that 1,000 litres of water every hour over the top of the edge of the tank.

With a SLO the outlet is sitting on the bottom of your tank and the water enters the SLO at the very bottom of your tank and travels up the pipe and then leaves through the side of the tank near the top. It's actually overflowing from the very bottom of the tank and not the top, and it's still the same, if 1,000 litres of water is pumped in, a 1,000 litres will leave the tank through the SLO, depending on filtration and pipe sizes etc, the pump needs to be controlled so that the same volume of water being pumped in is the same as what leaves the tank, any more and your tank will overflow.

Controling the pump is done with a tee piece and ball vavle between the pump and the hose outlet that pumps the excess water into your fish tank or sump and keeps the volume of water flowing into the grow bed/s so that the SLO doesn't overflow. The SLO also needs a tee piece at the top to stop it from siphoning all the water from your tank.

The fish solids close to the bottom of the SLO are caught in the current of water leaving through the bottom of the SLO and are drawn up the pipe and out of the tank. Any fish solids further away are sweeped closer to the SLO by the fish moving around the tank.

You can use air to help lift the Fish solids but it not to get the water moving, the pump does that, air is not necessary but it does help.

The size of your pump needs to be able to pump the volume of your fish tank every hour, you can always go slightly larger in pump size to cover any future expansion of your system, the excess water is then controlled by your tee.

The dimensions of your SLO piping should be as large as possible, if it's too small it restricts the volume you can pump. If you are using an IBC Tote as a fish tank the ideal size for the SLO would be 90mm pipe, in can be reduce to 50mm as it leaves the fish tank, or after if it suits. If your system is large use 90mm all the way.

Keep the slots in the bottom of your SLO small enough that any small fish can be drawn up into the pipe, about 6mm - 8mm would be enough.

My system has dual SLO's, the photo will show you the bottom outlet of my SLO's

Shaunohara I hope that helps, if you need any more info just PM me.


Attachments:
SLO (Small).jpg
SLO (Small).jpg [ 86.35 KiB | Viewed 1568 times ]
SLO Bottom (Small).jpg
SLO Bottom (Small).jpg [ 64.77 KiB | Viewed 1568 times ]

_________________
My System:
viewtopic.php?f=18&t=15600&hilit=joblow%27s+system

My Fish:
https://www.youtube.com/channel/UCtiiZv ... iWEVFANEVQ
Top
 Profile  
Reply with quote  
 Post subject: Re: slo.
PostPosted: Oct 7th, '18, 20:20 
Offline
Valued Contributor
Valued Contributor

Joined: Jan 31st, '18, 03:06
Posts: 86
Gender: Male
Are you human?: Yes
Location: Canary islands, spain
the ft is 1700l. the sump is 1m underground. i have a resin 5 the lifts the water 3m, so 1550l/ h flows in. the water flows into a rff filter, then 2 grow beds with expanded clay? then into 4dwb before returning to the sumpImageImageImage

Enviado desde mi SM-G920F mediante Tapatalk


Top
 Profile  
Reply with quote  
 Post subject: Re: slo.
PostPosted: Oct 7th, '18, 20:24 
Offline
Valued Contributor
Valued Contributor

Joined: Jan 31st, '18, 03:06
Posts: 86
Gender: Male
Are you human?: Yes
Location: Canary islands, spain
thankyou for your replies and explanations.
as i understand it, water flows in and out if there is a hole, even if it has to go up to get to the hole.
the slo designs i have seen feature a rff and the slo pipe is inverted u shaped ? the outlet underwater. so? is there a syphon effect ig the mputh of the slo and the outlet are at the dame height?

Enviado desde mi SM-G920F mediante Tapatalk


Top
 Profile  
Reply with quote  
 Post subject: Re: slo.
PostPosted: Oct 8th, '18, 02:16 
Offline
Xtreme Contributor
Xtreme Contributor

Joined: Feb 8th, '17, 18:03
Posts: 230
Gender: Male
Are you human?: YES
Location: UK East Sussex
there would be a siphon effect if the was no air inlet at the top of the up-flow pipe. To avoid causing a siphon effect, which would empty the tank down to the height of the of the outlet, the they are normally designed like this:

Attachment:
slo.png
slo.png [ 7.61 KiB | Viewed 1524 times ]


Here a siphon isn't created because the top of the up-flow tube is open to the air.


Top
 Profile  
Reply with quote  
 Post subject: Re: slo.
PostPosted: Oct 8th, '18, 19:46 
Offline
Valued Contributor
Valued Contributor

Joined: Jan 31st, '18, 03:06
Posts: 86
Gender: Male
Are you human?: Yes
Location: Canary islands, spain
this is how i adapted anslo into my system;the red outlet valvle at the bottom is connected to a 1m 60mm diameter tube inside the tank. The tube has slits. I connected it up to the grow beds.
it isnt perfect but its what i came up with. my system is new. the nh3 was a bit elevated. running it through the grow beds has made a difference.
ImageImageImageImage

Enviado desde mi SM-G920F mediante Tapatalk


Top
 Profile  
Reply with quote  
 Post subject: Re: slo.
PostPosted: Oct 8th, '18, 20:35 
Offline
A posting God
A posting God
User avatar

Joined: Jul 6th, '14, 20:25
Posts: 3831
Location: 2.2 kilometers up, NM, USA
Gender: Male
Are you human?: Series of particles
Location: Sapello, New Mexico USA
Hi Shaun
Is this your fish tank?
Image
If so the significant difference is with the pipe coming out the bottom instead of just below the surface of the water you risk emptying the fish tank if there is a leak. With the bulkhead near the top and an anti-siphon drain the water won't ever go below the higher placement bulkhead.
Brian

_________________
:wave1: Brian's AP
:dontknow: I don't understand all I know about this :dontknow:
Specs: 2600 gallon (347.56cf) Masonry fish pond. 44cf GBs. 200 gal (26.7cf) ST. 15 gal (2cf) RFF. 50 gal (6.7cf) biofilter. Brook trout and Comets.


Top
 Profile  
Reply with quote  
 Post subject: Re: slo.
PostPosted: Oct 9th, '18, 00:10 
Offline
Valued Contributor
Valued Contributor

Joined: Jan 31st, '18, 03:06
Posts: 86
Gender: Male
Are you human?: Yes
Location: Canary islands, spain
point taken, Brian.I included the valve in the event that i had to/wanted to empty the tank.. Didn't think about leakages.


Top
 Profile  
Reply with quote  
 Post subject: Re: slo.
PostPosted: Jan 17th, '19, 18:08 
Offline

Joined: Jan 17th, '19, 02:22
Posts: 2
Gender: Male
Are you human?: yes
Location: Lanzarote
Hi Shaun

My name is Trond Egil Thorrud. I am from Norway and I just moved to Playa Blanca, Lanzarote. I am planning to set up an IBC system in my backyard as a pilot to a project which my NGO is planning to do in India. My NGO will give IBC systems to poor people there.

But first I want to build it myself. I have little network here so I am looking for someone who might be able to give me some advice. It looks like you are the only one here. Are you able to contact me? I don't know how this platform works. Have tried to leave a message a few places but don't know if it reaches

My contact is : trond.thorrud@gmail.com or phone: +4797177116 (also WhatsApp)

Thanks

Trond


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 11 posts ] 

All times are UTC + 8 hours


Who is online

Users browsing this forum: No registered users and 10 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Powered by phpBB® Forum Software © phpBB Group
Portal by phpBB3 Portal © phpBB Türkiye
[ Time : 0.089s | 18 Queries | GZIP : Off ]