Bog building, also called upflow filter, eco filter, wetland filter

[archangel]

4” for bottom diffusion will work great. Face your slots/holes downward.

Thanks. What’s the real advantage of doing this? To decrease the water pressure more? I was thinking putting it up to avoid future issues clogging.

 

[archangel]

Since you already have the 4", that's fine. A bit overkill, but fine.

My bog is 14 feet X 5 feet with 12 inches of gravel and I used two 10 foot long 2 inch pvc pipes as my manifold. It's been running non-stop for almost two years and all is great.

I faced my slits up instead of down figuring if there is ever any chance for muck buildup, the slits won't get blocked. Many others have faced them down.

I think cutting slits is better than just drilling holes which may get blocked by the gravel easier.

I cut the slits 1/3 through the PVC and spaced them 1-1/2 inches apart.

Thanks for all the info.
So is there any advantage using 2” other than saving money? Or is 4” a better option? I can probably buy a whole 2” set up with the price of the two 10ft 4” pipes i need to buy

 

[addy1]

I used 2 27 foot long 2 inch pvc pipes. Slits cut facing down, 10 years later , no cleaning (big deep bog) still working great.

 

[GBBUDD]

The size is primarily for glow amount and bogs should have a good flow but only to the point that the water has a chance to move SLOWLY through the bog . A 4 inch line will give you Crazy flow amounts that only a 1/4 acre bog would need a 4 inch line.

Now the centipede 12 inch has slots cut throughout and this is right below aquablocks.. the idea there is for the water to sit and settle out.alow any debris in the water to drop out . We have all seen the dirty glass of water that's left a few days and you see the clear separations. Same principle. Yes 2 inch will work just fine and slots cut 1/3 through the pipe slits down imo.

 

[addy1]

No clue on how fast my flow is, a leaf flows from one end to the waterfall rock pretty fast. But the water is going through a lot of gravel. Pump rated 6800 gph.

 

[archangel]

The size is primarily for glow amount and bogs should have a good flow but only to the point that the water has a chance to move SLOWLY through the bog . A 4 inch line will give you Crazy flow amounts that only a 1/4 acre bog would need a 4 inch line.

Now the centipede 12 inch has slots cut throughout and this is right below aquablocks.. the idea there is for the water to sit and settle out.alow any debris in the water to drop out . We have all seen the dirty glass of water that's left a few days and you see the clear separations. Same principle. Yes 2 inch will work just fine and slots cut 1/3 through the pipe slits down imo.

I'll be using plastic pallets instead of aquablok so hopefully it can mimic the same effect. How wide do the slots usually need to be? I'm assuming with a 4" pipe a bit bigger?
Thanks!

 

[archangel]

No clue on how fast my flow is, a leaf flows from one end to the waterfall rock pretty fast. But the water is going through a lot of gravel. Pump rated 6800 gph.

My pump is rated 5200 gph, but I'll be splitting that in 2 places to have a couple jets.
Will this be enough? Pond size would be around 15'x6' 3ft deep, head pressure is about 10ft and waterfall approximately 2ft wide
Thanks!

 

[poconojoe]

My pump is 3600 GPH and does fine. The rate of flow seems perfect and It only feeds the bog.

If you split the output of your pump, you could use a valve on each output to have the ability to fine tune how much goes where.

 

[archangel]

My pump is 3600 GPH and does fine. The rate of flow seems perfect and It only feeds the bog.

If you split the output of your pump, you could use a valve on each output to have the ability to fine tune how much goes where.

That's exactly what I want to do, that way I can also control the flow going to the bog.
Have any of you try plastic pallets?

 

[poconojoe]

That's exactly what I want to do, that way I can also control the flow going to the bog.
Have any of you try plastic pallets?

Some people have used plastic milk crates in lieu of aqua blox.

My bog is the more simple version, without any centipede, aqua blox, etc.
It's just the manifold pipes directly covered with the gravel.

I do have the clean-out stacks at the end of each 2" manifold leg. Maybe every few months I'll turn off the pump, remove a screw cap, turn the pump back on and watch the black water shoot out for maybe 3-4 seconds. Then repeat for the second one. I shoot the water into a garden for great fertilizer.

 

[combatwombat]

Have any of you try plastic pallets?

I tested with light duty plastic pallets and chose to go with milk crates as I felt they were stronger and could access a large quantity of them. If I could access heavy duty pallets, I would use those instead.

 

[combatwombat]

Thanks. What’s the real advantage of doing this? To decrease the water pressure more? I was thinking putting it up to avoid future issues clogging.

The purpose is to make full use of the depth of your gravel. The outside diameter of 4" sch. 40 pvc is 4.5". With the slits facing upward, the bottom 4.5" of your bog will have semi-stagnant water. It's probably not that big of a deal, but seems best practice to face them downward.

 

[poconojoe]

The purpose is to make full use of the depth of your gravel. The outside diameter of 4" sch. 40 pvc is 4.5". With the slits facing upward, the bottom 4.5" of your bog will have semi-stagnant water. It's probably not that big of a deal, but seems best practice to face them downward.

I never thought of it that way where muck could accumulate due to the slits being on top.

I will note though that it's not the full diameter of the pipe in question due to the slits being cut 1/3 through. So it's really only the dimension of the lower 1/3 of the pipe's diameter where muck might accumulate under the gravel.

Not that I disagree, just my thought.

Also, it seems a lot of people have broken the so-called bog building "rules" in many aspects and have not had any problems.

 

[addy1]

Some people have used plastic milk crates in lieu of aqua blox.

My bog is the more simple version, without any centipede, aqua blox, etc.
It's just the manifold pipes directly covered with the gravel.

I do have the clean-out stacks at the end of each 2" manifold leg. Maybe every few months I'll turn off the pump, remove a screw cap, turn the pump back on and watch the black water shoot out for maybe 3-4 seconds. Then repeat for the second one. I shoot the water into a garden for great fertilizer.

Me too , simple,, I don't even have cleanouts

 

[archangel]

The purpose is to make full use of the depth of your gravel. The outside diameter of 4" sch. 40 pvc is 4.5". With the slits facing upward, the bottom 4.5" of your bog will have semi-stagnant water. It's probably not that big of a deal, but seems best practice to face them downward.

Oh I didn't think of it like that and it does make sense. But my idea is to dig the trench for the pvc pipes at the bottom, so the slits will be flush with the bottom when it hits the plastic pallets, does that makes sense? isn't that better or even like that you would still face them downward?