If one pumps water from a source at a rate of 7 cusecs cubic meter per second, how many cubic meters of water would be pumped in 24 hours?

Assuming US gallons, 346.5 cubic inches per second.

The number will be slightly different for Canadian or Imperial gallons.

X 60

Gas meters are usually rated in cubic feet per minute (CFM) not BTU. there are 1027 BTU per cubic foot so do the math. Try the link below Btu rating on natural gas meter

I am not an expert on your particular Intex model ...

I believe your pressure readings are with in normal parameters. Is your water clean?

Is it balanced? Your goals should be Alkalinity of 100 (no less than 80 and no more than 120, pH should be 7.4 (but no less than 7.0 and no more than 7.8) and your chlorine should be 5 ppm. I recommend a DPD test kit Cyanuric Acid should be about 50 but no less than 40 and no more than 80. Cyanuric Acid is also called stabilizer. Its function is to protect the chlorine you are making in your cell. Refer to your owners manual for how much salt you should have in your pool. 3200 ppm salt is a window to shoot for. You can get a test kit for salt. Salt, like calcium, is persistent in the water. The only way salt and calcium get out of the pool is through back washing, splash out and what you carry off with your swimming attire. Chlorine is affected by the sun and materials introduced into the water by the swimmers as well as what jumps, falls or hops into the pool. pH is not necessarily affected by the sun but the other factors do come into play. A properly balanced pool (alkalinity-wise) will not have pH "bounce". If your pH is bouncing, that is an indicator that your alkalinity is out of whack.

If your pool is 4 feet deep, you have about 8,640. Your goal should be for a 8 hour turn over rate (your pump should be pumping no fewer than 1,120 gallons per hour). BTW, studies show that if you run your pump 24/7 with a 8 hour turn over rate, it still takes up to 5 days for every drop of water in your pool to actually pass through the sand.

You could install a flow meter in your return line. It is simple to do - drill a hole in the return line and attach the meter. Rule of thumb - a 1.5 hp motor (probably bigger than yours) will move about 50 to 70 gallons per minute through a 1/5 or 2.0 pipe. A 2 HP motor will move between 60 and 80 gallons per minute through a 2 inch pipe (and filter, of course). Get a flow meter at your full service pool supplier. It will come with full particulars.

With a clean filter (note the pressure) you should back wash when the pressure increases by about 10 PSIG (Pounts Per Square Inch on the Gage) from the pressure when clean.

I hope this information helps you ...

Thanks for your question @ FixYa.com

Rule of thumb for a 2 HP pump using a 2 inch pipe is between 60 and 80 gallons per minute. Factors affecting flow rate is the distance between the pump and the pool, how many bends and turns and of course the condition of the filter. If you need to meet a specific turn-over rate, use the lower number to determine in the event you sould be called on the carpet.

Low speed? I am sorry. I don't know the rule of thumb on this.

You could install a flow meter, available at your professional pool supply. They are easy to install and not a lot of money. Follow the installation instructions as best as you can.

Incidently, comercially speaking, the 'turn over rate' should be around 8 hours for a public pool. Your jurisdiction may have other standards. Commercial pools should run 24 hours a day at that rate during the open season. Turn over rate means all the gallons of the pool should go through the filter in 8 hours, or all the gallons should go through the filter three times per day. Example: 16000 gallons of water in the pool, your filter and pump should be pumping 2000 gallons per hour. Studies show that it actually takes up to 5 days to get every actual 'chunk' of water to go through the filter, so, many of the 'chunks' of water go through the filter multiple times per hour. BTW, I use the word "chunks" in an effort to better paint a mental picture of what is happening. I am not suggesting your water has "chunks" in it.

Thanks for your question @ FixYa.com

Hi again ... Thanks for the Chat yesterday. Have you considered this article: http://www.directpoolsupplies.com.au/webcontent34.htm (click specifically on maintenance of your salt cell) There are lots of good tips here for the pool owner.

I see that this manufacturer wants 4000 ppm salt (4%) minimum to 7000 ppm salt (7%) maximum which is above the standard here in North America. You are in Australia? According to the manufacturer, your cell may be at the end of its life.

Sudden low filter pressure could be a broken lateral in a sand filter (you would probably have sand in the pool) or a hole in a paper filter (no indicator other than low pressure).

Here are some useful numbers for your 4 X 12 X 30 foot pool:

1440 cubic feet or 40.776259104 cu meters
1 cubic foot = 7.5 gallons or
1 cubic foot = 0.0283168466 cubic meters.
1 cubic meter = 264.172052 US gallons.
1 cubic meter = 1000 liters ( you probably know this stuff though)

I calculate your pool to be about 10800 gallons. The actual gallons per foot is really 7.48 (10771.2 in your pool) but we use 7.5 gallons per foot.

One inch in your pool is 225 gallons or 851.71765 L. This will give you some idea about what chemicals you may have to add with one inch of make up water.

If you were in NJ, and a commercial pool, you would have to have a a 8 hour turn over rate with a filter = 60 square feet and your flow rate would be about 22.5 gallons per minute.

Please keep your water balanced with the proper amount of Calcium (about 350 ppm) your pH at 7.4 - 7.6 your TA around 100 (80 min and 120 max) and your salt per manufacturer recommendation, in this case about 5000 ppm. Cyanuric acid around 80 ("Sun screen" for chlorine) and of course Cl around 3 to 4.

I hope you have found this information helpful. Enjoy your pool, while we shiver here in the North East.

If you look at the pump cabilities the max life is either 2.3 or 2.4 meters. I.e 7.88 Feet max lift. I looked up even the 5000 Liter per hour pump and it only has a lift of 2 meters. 10 feet is 3.048 meters. It seems your height requirement lift of 10 fee is greater than the lift capability of the pump. You can... install a second pump with a hidden reservoir at the 5 ft lift mark behind the water fall to get the desired flow. Or change to a submersible 1/2 hp well pump as most will give you 10 to 12 GPM flow rate and will elimate the 10 ft lift problem. A shallow well pump could be installed above the water (encased / hidden and provide you with 23 feet of lift.

The problem you have is the 10 ft lift distance is more than your current pump can provide.

Thanks for choosing FixYa.

Kelly

164248.5125550878 is the convert. Or you can go to link below.

http://www.convertunits.com/from/cubic+feet+per+second/to/cubic+meter+per+second

That's a lot of water. In the U.S. , pumps are rated in GPM (gallons per minute. Your 20000 liters per hour converts to 88 GPM. So you need to find a pump that can produce at least 88 GPM.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c