Mid-Construction DIY - STUCK! - PLEASE HELP!!!

[shlomikalfa]

I'm making my own DIY pool nowadays, got my hole ready and all the ground is ready for cement pouring but i'm stuck with the whole plumbing!!!

1. Which pipes size should I use?
2. Which jets would work for the spa area and how many can work with my pumps?

My pump details:

HZS-300

Max flow: 9M³/H

Max Lift: 7M

Voltage: 220V-240V/50HZ

Power: 300 W

Outlet Size: 40 MM

Jets:
Are these OK: Mumusuki 1.5in Outdoor Swimming Pool SP-1434 Massage Pool Spa Massage Nozzle Accessory
Or these: Swimming Pool Massage Nozzle - Swimming Pool Nozzle Adjustable Massage Jet Water Outlet Bathtub Nozzle Pool Accessories

I've attached a scheme of how I Plan to do the plumbing, if anyone has any ideas I would love to hear that!

Please help me! Thanks!

 

[ajw22]

Let's get @mas985 ideas

 

[mas985]

The schematic is not very clear. Are the two pump returns combining before the pool? If so, bad idea. Keep them separate for separate functions. The venturi jets should have their own pump.

The jets posted do not have any information about required flow rate or orifice size which is necessary for a proper design.

9 cubic meters per hour is a very low flow rate. Are you sure about that? That pump will not work with any jets except.

 

[shlomikalfa]

Hi, thanks for the reply!!!
I can see where you are having issues with my diagram
I'll make a new diagram which is more comprehensive and upload it again for a review if you can do that before I dive head in and realize there's no water yets

I was thinking about combining the pumps return to achieve better flow on lower running costs... I dont mind my jets 'slow' when only 1 pump is on... When you turn on 2nd pump you get the better flow for jets...
Why not combining those?!

About the jets -
I've done some more reading and yes the pumps are too weak for 8 but should be ok for 6 ... haywards jet air III are labeled 10gpm, thats roughly 2 m3/h so running both pumps gets me to 18 m3/h
So I was thinking I should be able to get to 6 jets...

thanks plenty!!!!!

 

[mas985]

The maximum flow rate rating is at runout which means there is no head loss due to plumbing. You won't get that much flow. In fact with jets, you will probably get less than half that.

Also venturi jets have much more head loss than a standard return eyeball, so if they are in parallel, most of the water will go out the returns instead of the jets. It just won't work that way. Venturi jets need to be on a separate loop from the returns.

 

[shlomikalfa]

@mas985
I've made a new and I hope a better diagram... also have sorted out my hole plan for how it should look

I understand what you are saying so I should probably get a stronger 2nd jet pump...
About the pumps flow combination - doesn't the check valve and the fact that there is a certain flow going towards the jets help in that?
I was hoping to get a slow flow from the jets and when I turn on the 2nd pump + blower get that bubbly show...

 

[mas985]

About the pumps flow combination - doesn't the check valve and the fact that there is a certain flow going towards the jets help in that?

No, the check valve only prevents back flow. The pump through the filter will have more head loss than the jet pump so there is an imbalance in flow between the two. It is also very inefficient energy wise. You would be better off with a single VS pump and simply change the speed for different jet strengths. Plus the cost of two pumps is likely going to be about the same as a single VS pump.

I was hoping to get a slow flow from the jets and when I turn on the 2nd pump + blower get that bubbly show...

Again, a VS pump is perfect for this application. You can adjust it to anything you like.

 

[shlomikalfa]

@mas985 Thanks for your reply!!! You're the only one who is willing to pour some light on this thing and the only help I've got so far...

Considering how much you're against my idea of having the 2 pumps combined...
Maybe this will work better? - attached another scheme.

How about the pipes sizing? 63mm / 2" for the whole system is OK?
- If so, Do I just run the whole system on 63mm and place some fittings to downsize it when it reaches the pumps / jets etc?

How big should the jet pump be, m3/h wise?
Is the blower big enough?
Does the filter fit?
Are 4 main drains an overkill?

Any chance for amazon links maybe?
- Which Return inlets should I get for the main loop?
- For a 3 way electric valve I can use / order?
- For a proper check valve for the blower.
- For pressure gauges and ball valves...

Again, Thanks plenty man!!!!

EDIT -->> Added another scheme... changed some pipes sizes etc... hoping for some input from the pros

 

[shlomikalfa]

Hi,

I was wondering if putting a pressure gauge on every pipe is OK or it should be avoided?
DO they interfere with the flow much?

thanks.

 

[AQUA~HOLICS]

What are you trying to accomplish by this?

 

[1poolman1]

Why? On commercial pools one is required on the last pipe before the pool, but only to check for blockage.

 

[mkflyfish]

I would not want that many pressure gauges introducing places to leak.

I’d personally like something like a Blue-White flow meter for PVC pipe, or even the digital version, on my return line, just haven’t had the time to order one and get it installed

 

[shlomikalfa]

Filter outlet is 1.5", pump is also 1.5" - flow is 8m3/H
Jet bodies says 1.5" as well...
The main drain goes for 2" though...

so outflow - 2" and return pipes 1.5" ?

Or perhaps since I want to have some jets going (7) I'll need something like 90 GPM running so I better get the pipes up to 2" all around?

Thanks

 

[Jimrahbe]

My personally opinion is that Flow gauges are really a solution to a problem that does not exist. They are just not needed in most cases.

Thanks,

Jim R.

 

[shlomikalfa]

Hi,

I'm trying to make my own pool DIY and I've got stuck with a hole and issues with plumbing!

How do I use the jets?

I want to use the Hayward SP1434PAKA Jetair III Water Body
which have 1.5" connections...
I've realized that each of those requires about 10 GPM, I want to have 7 - that's 70 GPM.
I've read that for better efficiency I should use bigger pipes - ie 2 \ 2.5" - If so - how do I connect the bodies to the main pipe then? multiple connectors?! up-scaling and down-sizing the pipes after each jet?

please help. thanks!

 

[1poolman1]

Use as much 2" as you can.

 

[shlomikalfa]

So basically:
Pump-> 1.5" (38mm) -> Filter -> heater -> Upscale to 2.4" (63mm) -> All the way to jets side - Downscale to 1.5" -> connect all jets.

Yes?

 

[shlomikalfa]

OK ... so only on main line then.... will do thanks.

 

[shlomikalfa]

Well... updating my latest scheme... hoping for some input

 

[mas985]

So basically:
Pump-> 1.5" (38mm) -> Filter -> heater -> Upscale to 2.4" (63mm) -> All the way to jets side - Downscale to 1.5" -> connect all jets.

Yes?

Correct.

I still think recombining those lines is a big mistake. If you upsize the jet pump such that it can generate enough pressure and flow for the spa jets, the main pump could end up being dead headed because it will be much smaller. And dead heading a pump is a really really bad thing to do. The main pump is really too small to add anything to the jet pump so I would not bother connecting them.

As for a proper jet pump, you will want one with a maximum head north of 24 m and a maximum flow rate better than 32 m^3/hr.

OR as I mentioned before, a single large VS pump can handle both jobs.