Would this work for backwash discharge?

Chungus

Gold Supporter
Jul 14, 2019
38
Texas
I have a 2” pvc pipe leading out of my backyard for my backwash water. Using a 3hp intelliflow pump. Outside of the fence for my back yard I have around 30 acres.

Instead of just letting the water run on the ground could I mount on of these on the discharge pipe and have it water part of my pasture?

 

cfherrman

TFP Guide
May 10, 2017
2,491
Hays, Kansas
I'd look into some sort of hose with holes in it and that's open on the end as cya is lowly toxic and also there is salt in the water you don't want to water the same spot over and over you could just do like flood irrigation and move the hose to a different spot every time you mow it
 

Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
23,869
SouthWest Alabama
I don't normally disagree with JohnT, but given the pump you have, I think you could bump the pressure up a little and use the 16mm nozzle and get pretty good backwash flow.

Which filter do you have?
 

Chungus

Gold Supporter
Jul 14, 2019
38
Texas
I know very little about pools. This is my first and it has only been full about a week so I am learning. If I size the sprinkler head appropriately in terms of gallons per minute how is it going to slow down the flow? For example if the pump is putting out 100 GPM and the sprinkler head can flow 100 GPM how is anything being slowed down?

The filter is a Pentair Triton sand filter I believe. Not exactly sure which one I am not home to go look.
 

Newdude

Well-known member
Jun 16, 2019
2,426
NY
For example if the pump is putting out 100 GPM and the sprinkler head can flow 100 GPM how is anything being slowed down?
Everytime it impacts. The ‘Tss Tss Tss Tss’. It will momentarily stop the flow to build pressure to launch the next squirt. It’s not a constant stream of 100GPM.
 

Chungus

Gold Supporter
Jul 14, 2019
38
Texas
That makes sense with the momentary stopping and that may cause issues with the back flow I don't know but if it flows 100 gpm it must be flowing more when it is on to compensate for the momentary off. By that I mean if the head flows 100 gum and it is off 50% of the time for the impacts then when it is actually squirting it is doing 200 GPM to compensate so that 100 GPM actually makes it out the nozzle.

I am not dead set on putting a sprinkler head. I have a hose attached that can be moved around. I don't mind doing it but I am gone a lot for work and the wife hates it. I just want something set up with this discharge water where she doesn't have to mess with it, move things around, etc. My desires are not so much to water the pasture I don't care I just don't want a giant mud hole from the water going into a concentrated area. Where it is there is a dirt road that lead to my shop that it flows down to. Dispersed with a sprinkler it would not be a problem, the way it is now the road gets muddy.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
26,552
Laughlin, NV
How often are you backwashing? Should only be a few times a year if the system is properly sized. Only back wash when your filter pressure rises by 25% over clean pressure.
 

Newdude

Well-known member
Jun 16, 2019
2,426
NY
I am not dead set on putting a sprinkler head
I’m rooting for you to figure it out. I’ve been toying with a similar idea to run a pool feed through my regular Spinklers. When I need to drain it would spread it evenly and my pool water works wonders for my grass.
 

Chungus

Gold Supporter
Jul 14, 2019
38
Texas
Maybe it is because our pool is new, they are doing rock work on the outdoor kitchen by it, and we have no cover yet (it is on order) but every time we thoroughly clean the pool with the vacuum the filter pressure rises. I have never seen it rise just from being in filter mode it happens when we clean it which with everything going on back there is every other day.
 

Bama Rambler

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Jun 22, 2009
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SouthWest Alabama
Everytime it impacts. The ‘Tss Tss Tss Tss’. It will momentarily stop the flow to build pressure to launch the next squirt. It’s not a constant stream of 100GPM.
That's not exactly how it works. It is a constant stream of water out of the nozzle. The 'Tss, Tss, Tss, you hear is the impact hammer interacting with the stream to ratchet the head around.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
26,552
Laughlin, NV
Get a robot. That way when you clean it the stuff does not go to the filter.

Any chance you can fill out your signature. Helps us help you.
 

Chungus

Gold Supporter
Jul 14, 2019
38
Texas
I’m rooting for you to figure it out. I’ve been toying with a similar idea to run a pool feed through my regular Spinklers. When I need to drain it would spread it evenly and my pool water works wonders for my grass.
I would be concerned about running it through your regular sprinklers. The backwash water isn't clean and regular sprinklers get plugged up easily.
 

Newdude

Well-known member
Jun 16, 2019
2,426
NY
That's not exactly how it works. It is a constant stream of water out of the nozzle
Not the ones they use by me. You can see the stream stop. It serves 2 purposes, to advance the head (when applicable, some are fixed and have wheels to move the whole contraption instead of just the head). But really to allow more water to fall between the nozzle and the puddle at the end of the stream, without the continuos push from behind at that moment. Most of the ones used on the farms here have the impact hammer hit vertical instead of the horizontal home sprinkler kinds. Those ones completely block the stream and for a moment the arced stream drops before their next burst.

will that matter through the filter ? I have no idea. My point was that it might not be a perfect 100GPM through the filter and averaging 100GPM *may* not have the desired result.
 

Brett S

Well-known member
Mar 15, 2019
443
Orlando
That makes sense with the momentary stopping and that may cause issues with the back flow I don't know but if it flows 100 gpm it must be flowing more when it is on to compensate for the momentary off. By that I mean if the head flows 100 gum and it is off 50% of the time for the impacts then when it is actually squirting it is doing 200 GPM to compensate so that 100 GPM actually makes it out the nozzle.

I am not dead set on putting a sprinkler head. I have a hose attached that can be moved around. I don't mind doing it but I am gone a lot for work and the wife hates it. I just want something set up with this discharge water where she doesn't have to mess with it, move things around, etc. My desires are not so much to water the pasture I don't care I just don't want a giant mud hole from the water going into a concentrated area. Where it is there is a dirt road that lead to my shop that it flows down to. Dispersed with a sprinkler it would not be a problem, the way it is now the road gets muddy.
The problem isn’t necessarily one of flow rate but more in how the backwashing process works. The backwash should be a constant stream of water rushing through the sand to wash out any junk that’s worked it’s way into the sand. There should be enough water flow to lift the sand up and stir it around a bit to help get everything clean. With a sprinkler continuing to start and stop the flow and adding additional head pressure then the cleaning process likely won’t work as designed and your sand won’t get cleaned as well as it should.
 
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YippeeSkippy

Mod Squad
LifeTime Supporter
Jan 17, 2012
13,002
Evans, Georgia
New pool, additional rock work in the yard... I can easily imagine you've got calcium dust still going on. Are you still brushing the pool? Do you see dust still?

Maddie :flower:
 

cfherrman

TFP Guide
May 10, 2017
2,491
Hays, Kansas
Put a PVC pipe to a small ditch that leads the water into your pasture. The PVC can be buried till it gets to s spot that won't mud up or won't matter. Use 2" pvc

Flood irrigation is where it's at here, any kind of pressure systems are gonna create problems now or down the road