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What Size Pool Pump To Buy?
Vanity

Posted on 04/07/2010 1:53:22 PM PDT by ExpatCanuck

I have a 7 year old 40K gallon inground concrete pool and the 2HP pump needs to be replaced. We typically run it 8-10 hours a day and have a DE filter and a spa. I've had someone tell me that if I buy a smaller pump (1HP for example), I can leave it running 24 hours a day and still spend the same in electricity. The advantage being that the water is constantly being moved and filtered and stays cleaner, albeit at a slower rate. Just wanted to get thoughts on this from others here.


TOPICS: Miscellaneous; Outdoors; Sports
KEYWORDS: pool; pump
My apologies in advance if this is posted in the wrong place.
1 posted on 04/07/2010 1:53:23 PM PDT by ExpatCanuck
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To: ExpatCanuck

WHAT VOLTAGE 240?


2 posted on 04/07/2010 1:55:50 PM PDT by garykfd (American by Birth, Southern by the Grace of God)
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To: ExpatCanuck

Check the energy use on the pumps. I think the newer pumps are more efficient. Buy a timer and experiment to figure out what is the minimum time. Not all problems are visible though and skin problems can be expected if you don’t get enough circulation.

Also, if you don’t get enough water flow your pool will end up a dark green.


3 posted on 04/07/2010 1:57:18 PM PDT by driftdiver (I could eat it raw, but why do that when I have a fire.)
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To: ExpatCanuck
From what I've been told, stronger pump is better. It moves the water better and, therefore, doesn't need to run as long to have x number of water changes per day.

The pool guy (who has no financial incentive whatsoever) keeps telling me how great the water movement is since I replaced the old system with a bigger pump.

4 posted on 04/07/2010 1:57:21 PM PDT by Abby4116
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To: ExpatCanuck

This sounds like a pretty good sized pool. If you buy a 1 hp it will burn up faster. I would run it a few hours a day. I would consider a chlorine generator that generates chlorine from small amounts of salt.

Call some pool places but a 2 hp or 2.5 hp sounds correct.


5 posted on 04/07/2010 1:57:26 PM PDT by Frantzie (McCain=Obama's friend. McCain called AMERICANS against amnesty - "racists")
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To: ExpatCanuck
I think it's the motor you are after and not a pump. The longer the circulation is going it is definitely better for cleaner water and less chance for algae to form. But I would not under power the system only to have weak circulation. Go with the 2HP motor that you have.
6 posted on 04/07/2010 1:57:49 PM PDT by avacado
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To: ExpatCanuck

You can buy a lot of electricity for the chemicals it will take to fix your pool if it gets out of whack.


7 posted on 04/07/2010 1:58:30 PM PDT by driftdiver (I could eat it raw, but why do that when I have a fire.)
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To: ExpatCanuck
Your kWH output will be directly proportional to HP of the motor given a common voltage. Running a 1 HP motor for 2hrs is the same as running a 2 HP motor for an hour.
8 posted on 04/07/2010 1:59:37 PM PDT by Perdogg (Nancy Pelosi did more damage to America on 03/21 than Al Qaeda did on 09/11)
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To: ExpatCanuck
I have a 16x36 in-ground (30K gallons) and for 25 years I've always run the filter 24/7. I use a 1 HP Haywood Superpump
I suggest you check with your local swim center for the best advice, then double check prices on-line.
If you wire it for 220V, you'll save on the electric bill.
9 posted on 04/07/2010 2:00:08 PM PDT by oh8eleven (RVN '67-'68)
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To: ExpatCanuck

The larger the pump motor, the less energy it consumes to do the same amount of work as a lower HP motor. Energy consumption is part of the total load. If the 1HP runs at 90% load, and the 2HP runs at 45% load, the 2HP will consume less energy to do the same amount of work since the current draw at the load will be less.

Volt x Amps = watts.


10 posted on 04/07/2010 2:00:45 PM PDT by Ouderkirk (Democrats...the party of Slavery, Segregation, Sodomy, and Sedition)
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To: ExpatCanuck

For keeping it as warm as possible ideally, you only want your pump on during the hottest hours of the day say from 11pm to 3pm. That way all the water circulates and gets heated by the sun.

Running it during cooler hours bleeds off the heat that’s built up, so it’s better to let it sit still.

Of course this all goes out the window if you also have a heater on your pool.


11 posted on 04/07/2010 2:01:59 PM PDT by Sax
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To: ExpatCanuck

Try this site, it seems to have quite a bit of info.:
www.poolplaza.com/pool-pump-sizing-2.shtml -

and yes this should be posted in the Pool Pump Forum.


12 posted on 04/07/2010 2:02:44 PM PDT by count-your-change (You don't have be brilliant, not being stupid is enough.)
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To: Sax
That's 11AM
13 posted on 04/07/2010 2:03:40 PM PDT by Sax
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To: ExpatCanuck

The cost of electricity is DIRECTLY PROPORTIONAL to the amount of work being done.

If you want to move 8 thousand gallons of water/day, it will cost you roughly the same no matter the size of the motor.


14 posted on 04/07/2010 2:04:02 PM PDT by Mariner
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To: ExpatCanuck

Just don’t let anyone pee in the pool!


15 posted on 04/07/2010 2:04:28 PM PDT by SWAMPSNIPER (THE SECOND AMENDMENT, A MATTER OF FACT,NOT A MATTER OF OPINION)
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To: ExpatCanuck
You have been misled.

A 1 HP motor running for 24 hrs. will consume the same amount of energy as a 2 HP running for 12 hrs. Here is the calculation:

2 HP x 12 Hrs x .7457 Kw/ Hp-hr x .12 $/kw = 2.15 $/day

1 Hp x 24 x .7457 x .12 = $2.15

You mention 8-10 hrs per day vs. 24, the only savings will come due to the shorter time of operation, not due to energy consumption.

The real question is how effective are the two methods.

16 posted on 04/07/2010 2:05:50 PM PDT by Michael.SF. (At least Hitler got the Olympics for Germany)
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To: SWAMPSNIPER

“Just don’t let anyone pee in the pool!”

...even if it DOES make it warmer!


17 posted on 04/07/2010 2:07:58 PM PDT by jessduntno ( If someone calls me racist, I reply "you are just saying that because I'm white!")
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To: ExpatCanuck

We have a 30K, IG, gunnite pool with 1.5 HP motor that runs all Summer (mid-May-early Sept). It’s not killing us on electricity and I think it keeps the heat more uniform and the chemicals better mixed. We also have a salt chlorine generator. Best investment we every made.


18 posted on 04/07/2010 2:11:27 PM PDT by redangus
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To: ExpatCanuck

Pool pumps are sized to a 8 hour pump cycle. This is because they generally are run during the day such as not to cause noise and problems with neighbors. The rule is the water should be turned over, that is pass through the filter, once in a 24 hour period.

The system is more efficient if the water is pumped slower over a longer period. All else equal, by pumping over a 24 hour period with 1/3 third the flow rate 1/3 the power will be used.

I also have a 40K gallon pool. I use two pumps. One, 3HP is used to run the pool cleaner when I want to. The other is a two speed that I have wired for low speed at 1/3 HP. I run it during the week continually unless I want to clean the pool. It is more costly in hardware but worth it given the cost of electricity in the area I am in.


19 posted on 04/07/2010 2:11:38 PM PDT by Dennis M.
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To: ExpatCanuck

Do people really run their pump that long?

I thought a couple of hours a day was sufficient


20 posted on 04/07/2010 2:14:22 PM PDT by Mr. K (This administration IS WEARING OUT MY CAPSLOCK KEY!)
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To: count-your-change
and yes this should be posted in the Pool Pump Forum.

There's actually a pool pump forum? :-)

Thanks, I'll check the link!

21 posted on 04/07/2010 2:17:07 PM PDT by ExpatCanuck
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To: ExpatCanuck
My apologies in advance if this is posted in the wrong place.

No, this is the perfect place. In fact, I was over at "www.PoolMaintenanceAdvice.com" this morning posting my thoughts on Obama's new health care bill and someone replied to my post and needed to know where to get pool maintenance advice. It sent him to Freerepublic.

22 posted on 04/07/2010 2:17:47 PM PDT by Onelifetogive (Flame away...)
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To: Dennis M.

I, myself, like to pump and filter more and chemically treat less. But I am willing to pay a price for the electricity.


23 posted on 04/07/2010 2:20:10 PM PDT by Haiku Guy (Gov. Chris Christie (R) won the NJ-6 held by Rep. Frank Pallone (D) by a 15.5% margin!)
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To: ExpatCanuck

You need a big’un


24 posted on 04/07/2010 2:21:53 PM PDT by envisio (My wife don't care if I smell like welding rods and gasoline. She actually kinda likes it.)
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To: Onelifetogive
No, this is the perfect place...

Hey, it was worth the laugh I got reading your response!

25 posted on 04/07/2010 2:23:29 PM PDT by ExpatCanuck
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To: Haiku Guy
I, myself, like to pump and filter more and chemically treat less. But I am willing to pay a price for the electricity.

I think yours is a good trade off, and it seems with the newer pumps I should be able to realize some savings even with the same 2HP size.

26 posted on 04/07/2010 2:26:13 PM PDT by ExpatCanuck
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To: ExpatCanuck

I have a 15k/gal pool and run the pump 4-6 hrs a day. I buy a bucket of 2” chlorine tabs and a couple of bags of baking and washing soda at the supermarket, a bottle od algecide and clarifier and it lasts all season. In Memphis.


27 posted on 04/07/2010 2:27:45 PM PDT by ebshumidors (Marksmanship and YOUR heritage http://www.appleseedinfo.org)
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To: garykfd

“WHAT VOLTAGE 240?”

220... 221, whatever it takes. :)


28 posted on 04/07/2010 2:31:47 PM PDT by sadamico (Can a state AG file a suit against the federal government for violating the US Constitution?)
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To: ExpatCanuck

Here you go. Now you have something exciting to do tonight.

http://www.haywardnet.com/pdfs/Pump_filter_sizing.pdf


29 posted on 04/07/2010 2:58:08 PM PDT by VeniVidiVici (Alfred E. Neuman for President! Oh, wait a minute ...)
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To: ExpatCanuck
Don't buy a smaller pump thinking it will save money.

Have you checked-out the Pentair IntelliFlo Pool Pumps?

They're expensive but can really cut your energy costs. Probably pay for itself within a year or so.

30 posted on 04/07/2010 3:06:55 PM PDT by smokingfrog (Free Men will always be armed with the Truth.)
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To: Larry Lucido; Cagey; MotleyGirl70; Gamecock
I would recommend a large heat pump!

_______________________________________________________

Kramer: I'm freezin'! I just need to get my hot tub running. I'm waiting for my new heat pump.

George: Well what's in this giant box out in the hall?

Kramer: Uh? Oh that must be it.

George: It's huge!

Kramer: Yeah, yeah, I got the biggest one they had. It's industrial strength. 16000 BTU's.

31 posted on 04/07/2010 3:21:25 PM PDT by earlJam
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To: ExpatCanuck

No such forum but rules require that we have a go at serious inquiries.

The site is real and appears to have what you need and more.


32 posted on 04/07/2010 3:32:45 PM PDT by count-your-change (You don't have be brilliant, not being stupid is enough.)
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To: ExpatCanuck

Check the label on your 2hp pump for the “SF” the true hp is the rated hp multiplied by the SF number ,, it can range from 0.9 to about 1.5 ... if your 2hp pump is a SF 0.9 then you really have a 1.8 hp pump and a 1.5 hp pump with a 1.2 SF will replace it ...

With a DE filter you have a problem with dirt and debris going back into the pool after every instance the pump shuts off and restarts .. I am assuming your DE filter redeposits the DE powder on the screens automatically at startup ... with every power cycle you let MOST of your dirt go back in the pool ...That is why commercial/public pools are required to filter 24*7*365 .... you should probably get a sand filter..


33 posted on 04/07/2010 4:05:33 PM PDT by Neidermeyer
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To: ExpatCanuck
I got so much information about building our pool in this forum. A wealth of information!
34 posted on 04/07/2010 4:23:37 PM PDT by StrictTime (I used to be disgusted, now I try to be amused.)
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To: Michael.SF.
You have been misled.

I hate it when people try to misle me!

35 posted on 04/07/2010 5:11:31 PM PDT by Arthur McGowan (In Edward Kennedy's America, federal funding of brothels is a right, not a privilege.)
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To: ExpatCanuck
Used to be in the biz....

8 - 10 hrs a day is too much....IF that's your average over a year.

My rule of thumb was to buy the biggest equipment you can afford...and keep you water chemically correct.

Good luck!

36 posted on 04/07/2010 5:16:03 PM PDT by Osage Orange (Si vis pacem, para bellum)
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To: Michael.SF.
A 1 HP motor running for 24 hrs. will consume the same amount of energy as a 2 HP running for 12 hrs. Here is the calculation:

Yes, that said, does his service provider charge for tiers and time of day? If you exceed a certain level, they bump the cost per kwh meaning overall cost of ownership might be lower with a pump that draws less. Of course, if they charge more at peak then a stronger pump that can turn the water over faster but runs off peak would be the better choice.

37 posted on 04/07/2010 6:10:13 PM PDT by Malsua
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To: ExpatCanuck
I always recommend...more power. Get one of these babies...


Only have to run it about 2 minutes and it'll circulate the water real good for ya.
You might add some fountains while you're at it.

Noise ordinances might be a problem though. So you should only run it around 0330 just to be safe. Get some tarps to cover it up when you're not using it..
38 posted on 04/07/2010 8:48:20 PM PDT by Tainan (Cogito, ergo conservatus)
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To: sadamico

IF YOU GET A SMALLER MOTOR AND RUN IT 2X AS LONG U WILL USE THE SAME AMNT OF CURRENT OVER A 24 HR PERIOD;;;SORRY 4 CAPS


39 posted on 04/08/2010 6:01:46 AM PDT by garykfd (American by Birth, Southern by the Grace of God)
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