Is a pool pump speed controller necessary ?

Pool pumps, pool filters and the plumbing of
swimming pools. Sand filters, cartridge filters,
fabric filters and alternative filter media.
Teapot
Swimming Pool Pro
Swimming Pool Pro
Posts: 132
Joined: Tue 17 Oct, 2017 10:52
My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: Is a pool pump speed controller necessary ?

Postby Teapot » Wed 18 Oct, 2017 09:53

Hsiao, we need to know the size of your pool, the diameter of the plumbing, the size of your filter (dia), type of filter and length of plumbing run approx. You may want to add these details to your profile.
I started out varying the speed for different occasions (night and daytime) but like a lot of these features I don't use them now, just the increased speed for backwashing. I run around 69 watts so you can't go much lower.


Hsiao Chang
Pool Enthusiast
Pool Enthusiast
Posts: 24
Joined: Thu 12 Oct, 2017 20:09
My Pool: 110m3; 1.5hp pump Qmax: 350l/min Hmax:14m ; sand filter dia: 450mm,33kw heat pump, piping : 50mm

Re: Is a pool pump speed controller necessary ?

Postby Hsiao Chang » Wed 18 Oct, 2017 20:08

Denniswiseman wrote:What is the size of your pool (gallons/Llitres)
The controller sounds excellent being able to time at different speeds
I went from a 1hp to a .5hp because my pump was pushing to much water through my sand filter to filter properly
My pool is 10k UK gallons 45000 litres


It is a 110 CBM pool, 110k liters. yes, it sounds good as it offers 4 timers, though i don't think it's necessary to set so many as 4 and the
different of electricity rate vary little here during day or night , but the idea of running at a lower speed could cut the bill. but if i set the speed too low
i might have a problem with heater , do i understand this correctly please ?
Denniswiseman
Swimming Pool Superstar
Swimming Pool Superstar
Posts: 775
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Is a pool pump speed controller necessary ?

Postby Denniswiseman » Thu 19 Oct, 2017 02:35

Yes you are correct
Running at a slower speed will reduce your running costs substantally
You would have to adjust your speed by trial and error to find the minimum flow rate through your heater for it to operate
The same goes for a SWCG
I would think that you could run on a higher speed for cleaning / skimming / mixing chems then reduce to what lower speed operates your heater
There is no set rule for water turnover, whatever cleans your water
Teapot
Swimming Pool Pro
Swimming Pool Pro
Posts: 132
Joined: Tue 17 Oct, 2017 10:52
My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: Is a pool pump speed controller necessary ?

Postby Teapot » Thu 19 Oct, 2017 03:34

Hsiao, we need to know the diameter of the plumbing, the size of your filter (dia), type of filter and length of plumbing run approx. You may want to add these details to your profile.
The correct flow for your heater will be spec'd in the manual, often around 5m3/h. Is your heater plumbed on a bypass loop so you can adjust it?
You should get a flow meter to check the best flow to turn over your water. Gage & Bidwell's law of dilution gives us some expectations on how much water actually makes it through the filter. 1st turnover 63%, 2nd 86%, 3rd 95%, 4th 98%, 5th 99% of the water filtered. There are alternatives but they are all pretty close to one another. Personally I am happy with 4 turnovers per day and that fits nicely with the energy usage.
Hsiao Chang
Pool Enthusiast
Pool Enthusiast
Posts: 24
Joined: Thu 12 Oct, 2017 20:09
My Pool: 110m3; 1.5hp pump Qmax: 350l/min Hmax:14m ; sand filter dia: 450mm,33kw heat pump, piping : 50mm

Re: Is a pool pump speed controller necessary ?

Postby Hsiao Chang » Thu 19 Oct, 2017 20:45

Denniswiseman wrote:Yes you are correct
Running at a slower speed will reduce your running costs substantally
You would have to adjust your speed by trial and error to find the minimum flow rate through your heater for it to operate
The same goes for a SWCG
I would think that you could run on a higher speed for cleaning / skimming / mixing chems then reduce to what lower speed operates your heater
There is no set rule for water turnover, whatever cleans your water


Thank you Dennis, I think I understand things better now with your info. and instructions. the lowest RPM the pump speed controller can set is 1200 RPM,
it's even a lot less than 50% of its max. speed, 2900 RPM, I doubt if a pump would ever go that low because cleaning /skimming/ mix chems are
basics of a pool system which you can not skip.... or this could be something gimmicky, it 'sounds' great ,but not really practical in reality .
Hsiao Chang
Pool Enthusiast
Pool Enthusiast
Posts: 24
Joined: Thu 12 Oct, 2017 20:09
My Pool: 110m3; 1.5hp pump Qmax: 350l/min Hmax:14m ; sand filter dia: 450mm,33kw heat pump, piping : 50mm

Re: Is a pool pump speed controller necessary ?

Postby Hsiao Chang » Thu 19 Oct, 2017 20:56

Teapot wrote:Hsiao, we need to know the diameter of the plumbing, the size of your filter (dia), type of filter and length of plumbing run approx. You may want to add these details to your profile.
The correct flow for your heater will be spec'd in the manual, often around 5m3/h. Is your heater plumbed on a bypass loop so you can adjust it?
You should get a flow meter to check the best flow to turn over your water. Gage & Bidwell's law of dilution gives us some expectations on how much water actually makes it through the filter. 1st turnover 63%, 2nd 86%, 3rd 95%, 4th 98%, 5th 99% of the water filtered. There are alternatives but they are all pretty close to one another. Personally I am happy with 4 turnovers per day and that fits nicely with the energy usage.

Hi Teapot, thanks for your input, sorry i didnt realize this thread has come to 2nd page.i will update my profile after this reply.
Pool: 110 CBM
Pump: 1.5hp Qmax: 350l/min; Hmax: 14m
Connection: 50mm
Sand filter: 450mm
heatpump: 33kw output @26C/26C
Teapot
Swimming Pool Pro
Swimming Pool Pro
Posts: 132
Joined: Tue 17 Oct, 2017 10:52
My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: Is a pool pump speed controller necessary ?

Postby Teapot » Fri 20 Oct, 2017 02:39

Hi Hsiao, Thanks for the information. Yes you can save quite a bit by slowing down your pump. If I were building your setup you would have two 450mm filters for 110 CBM which would filter better and drastically cut your headloss.
More later as I have to go to work.
Denniswiseman
Swimming Pool Superstar
Swimming Pool Superstar
Posts: 775
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Is a pool pump speed controller necessary ?

Postby Denniswiseman » Fri 20 Oct, 2017 02:58

I have a 27kw heat pump and my minimum flow rate is 9 cubic metres hour
My .5hp pump gives me a flow rate of 10.8 cubic metres hour
Your pump has a flow rate of 21 cubic metres hour so I would expect you should be able to reduce your speed quiet a bit without affecting your heat pump check your minimum flow for your heat pump to work bearing in mind that you can always turn it up
Generally speaking you should match your pump to your filter (check your filter flow rate) as to great a flow doesn't filter as well because it is forcing the water through and not filtering
Slowing the flow will help filtering
Teapot
Swimming Pool Pro
Swimming Pool Pro
Posts: 132
Joined: Tue 17 Oct, 2017 10:52
My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: Is a pool pump speed controller necessary ?

Postby Teapot » Fri 20 Oct, 2017 12:56

The flow rate stated on the pump is at zero head, on a pool setup with a small sand filter like Hsiao's, I doubt if it's actually flowing any more than 10m3 or a bit less. Forget what manufacturers say they are just in competition with other manufacturers.
This week I removed a 2HP pump from a small pool with a 600mm (24") sand filter and that was only flowing at 10.3m3/hr. That's why I have recommended a flow meter, the only real way of seeing whats actually happening and vital when you go to multi speed pumps with low energy.
Hsiao, what does your pressure gauge read?
Hsiao Chang
Pool Enthusiast
Pool Enthusiast
Posts: 24
Joined: Thu 12 Oct, 2017 20:09
My Pool: 110m3; 1.5hp pump Qmax: 350l/min Hmax:14m ; sand filter dia: 450mm,33kw heat pump, piping : 50mm

Re: Is a pool pump speed controller necessary ?

Postby Hsiao Chang » Sun 22 Oct, 2017 22:03

Thanks you Dennis and Teapot for your information.
The pressure gauge reads 12 PSI. is there such a thing as an appropriate pressure reading given my pool setup please ?
why would you recommend 2 450mm filters for a 110 pool please ?

Return to “Pool Pumps, Filters, Plumbing & Piping”

Who is online at the Pool Help Forum

Users browsing this forum: CommonCrawl [Bot] and 1 guest