I use 90mm pipe. It goes from one side the other of my 5000 litre tank so is about 3 metres in length.
Every 50mm I have a 5mm slot which I used an angle grinder to create.
Here is the SLO across the bottom of the tank:
Here are the slots:
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| Author: | steveiscrazy [ May 14th, '11, 12:47 ] |
| Post subject: | hole sizes for SLO |
Hello everyone, I was wondering what size and how many holes you guys have drilled in the bottom of your SLOs. Also I remember seeing someone's design that had a T connection at the bottom of their SLO and branching out so that it could collect waste from the parts that extend out too. I was wondering if this is a good idea or not. Will drilling too many holes affect the suction action at all? |
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| Author: | arbe [ May 14th, '11, 13:33 ] |
| Post subject: | Re: hole sizes for SLO |
I use 90mm pipe. It goes from one side the other of my 5000 litre tank so is about 3 metres in length. Every 50mm I have a 5mm slot which I used an angle grinder to create. Here is the SLO across the bottom of the tank: Here are the slots: |
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| Author: | steveiscrazy [ May 15th, '11, 04:08 ] |
| Post subject: | Re: hole sizes for SLO |
Thanks Arbe, I like your design. Do you think the slots could be substituted with drilled holes and have the same effect? |
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| Author: | Stuart Chignell [ May 15th, '11, 08:15 ] |
| Post subject: | Re: hole sizes for SLO |
A standard for drains in recirculating aq systems is to size the holes so that the velocity is less than 30cm/s. Slots are better because they are less likely to block and easier to clean if they do. |
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| Author: | Jamey [ May 15th, '11, 09:56 ] |
| Post subject: | Re: hole sizes for SLO |
IV got 2 ends that i put on my slo, 1 has 10mm Slots, the other has 7mm Holes, the one with holes is for when iv got fingerling in there and then i swap it over once the fish are big enough to not get sucked through the 10mm slots. |
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| Author: | earthbound [ May 15th, '11, 12:24 ] |
| Post subject: | Re: hole sizes for SLO |
You dropped some bits in your tank Arbe...... 
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| Author: | arbe [ May 15th, '11, 14:04 ] |
| Post subject: | Re: hole sizes for SLO |
steveiscrazy wrote: Thanks Arbe, I like your design. Do you think the slots could be substituted with drilled holes and have the same effect? You could. You would just need a lot more holes to obtain the same amount of flow. @EB. I have fished them all out now. They were in there for the gold fish to hide in, in an attempt to keep the mozzies from breeding. |
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| Author: | TumblingWheels [ Jun 1st, '11, 12:46 ] |
| Post subject: | Re: hole sizes for SLO |
Sorry, I think I might be hijacking this thread  Arbe, do you ever get fish sucked into the SLO? |
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| Author: | arbe [ Jun 1st, '11, 18:57 ] |
| Post subject: | Re: hole sizes for SLO |
I've never checked. I would count the fish to see if they are all there but they are too quick. I will say I was concerned that may happen but when Troutman delivered them I showed him the design and he did say it wouldnt be a problem. |
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| Author: | earthbound [ Jun 1st, '11, 19:20 ] |
| Post subject: | Re: hole sizes for SLO |
Cool, trout deliveries and system advice at the same time.... 
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