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464 posts

Ultimate Geek
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Topic # 240643 18-Sep-2018 14:43
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Random question, I have a Spa Pool around 800-900L of water. Always had the temp set to about 40c and the controller was on automatic. 

 

I want to use a product called SimpleSilver but that needs to have 80,000-100,000 L of flow per hour. 

 

So I need to set my filter manually to run at a minimum 15 minutes per hour.  

 

I have no idea on average how many minutes per hour it runs on automatic and I assume forcing it on for 15 minutes will flow water through the system but may not need to heat it. 

 

My questions are

 

 

 

1. What's more expensive in the running costs the heating or the pumping of water?

 

2. What do you think this will do to the power bill?


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3394 posts

Uber Geek
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  Reply # 2092594 18-Sep-2018 14:59
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You need to know the pumps flow rate....

 

but I think you will need more than 15 mins per hour

 

If you need 80,000 l/h and you have 800 litres, that means you need to totally  circulate the water 100 times every hour, or 1.7 times a minute, @800 litres that's pumping ~ 1500 litres per minute... that sounds like a pretty big pump....


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  Reply # 2092596 18-Sep-2018 15:02
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That will be very expensive. You should consult the Spa maker to see if there is a better solution.





Mike
Retired IT Manager. 
The views stated in my posts are my personal views and not that of any other organisation.

 

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  Reply # 2092597 18-Sep-2018 15:04
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OP: Are you sure you have those numbers right?

 

25 litres per second (2.5 buckets per second) is quite a pump

 

 





Mike

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  Reply # 2092623 18-Sep-2018 15:39
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Website says this;

 

It is critical that your filter circulation pump circulates between 80-100,000 litres of water daily

 

  • Your calculation will be as follows:
  • If your filter circulation pump flow rate is 150 litres per minute
  • 150 litres per minute x 60 minutes = 9000 litres per hour
  • A flow rate of 100,000 litres is needed, then divide this by 9000 litres per hour = 11.11 hours
  • Set your filter circulation pump controller to operate for 11 hours each day

 

 

 


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  Reply # 2092628 18-Sep-2018 15:42
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Heating by far will be the big power user, around 3KW for a typical spa pool

 

 

 

 




464 posts

Ultimate Geek
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  Reply # 2092634 18-Sep-2018 15:45
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yeah my apologies, I knew it was per day, wanted to write per day but wrote per hour!

 

 

 

 


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  Reply # 2092635 18-Sep-2018 15:47
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tchart:

 

Website says this;

 

It is critical that your filter circulation pump circulates between 80-100,000 litres of water daily

 

 

daily, sounds a whole lot better than hourly :)

 

means. 100 cycles per day, ~4-5 cycles per hour, 

 

So if you want to run the pump for 15 mins per hour you need to check it can pump ~250 litres per minute...




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Ultimate Geek
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  Reply # 2092637 18-Sep-2018 15:54
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Yes, their website outlines by Spa model is to be set to 15 minutes. 

 

So I'm going to assume for the time being (and check before I do anything) that will work. 

 

Ultimately what I'm trying to work out is

 

1. Is the automatic option going to be much cheaper than this?

 

2. Is having just the pump going for 15 mins not too power hungry vs actually heating of the water which I assume is costly.

 

 


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  Reply # 2092685 18-Sep-2018 17:02
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kiwis:

 

yeah my apologies, I knew it was per day, wanted to write per day but wrote per hour!

 

 

At 80,000L per hour it may have been unsafe to enter the pool when they pump was running!





Mike

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