The pool light is usually on a 15 amp circuit. The breaker feeding this circuit must have a GFCI rating.
if pool is 25 m long , 15 laps is 25 x 15 = 375 meters, which is 3/8 kilometer
there are 4400 gal in my pool that is 15 x 4 ft.
A round pool that is 15 feet across and 48 inches deep holds up to 5,288.7 gallons of water.
There is no "real" normal. Pumps can show pressure readings around 10 psi (usually the minimum) to 20-25 psi. I have opened my pool one spring with a pressure of 10 psi and the next year open the pool with a reading of 15 psi. Nothing is wrong with the pump or filter as I get good flow in the outtake and the debris sight glass (on the filter) is crystal clear. A good solution to ensure proper pressure would be to "baseline" your reading on opening of the pool. It it reads, for example: 10 psi, this would be your baseline reading. Keep a watch of your gauge. Make sure when your pump if off, your gauge should show a reading of "0". If it increases to 15-20 psi during operation, it's time to back flush. Your pressure gauge is an excellent tool which will tell you when you should back flush....
You can get by with a 1/2 hp pump if everything else is sized correctly and it is just for circulation only.
A small sand filter 40-60 sq ft. and a small pump 3/4 HP
Typical in-ground pool dimensions are 10 x 20, 15 x 30, and 20 x 40. Depending on which size you choose, you would need to add on at least 3-feet on each side of the pool for an apron. Although these are typical pool sizes, a pool can be any size that you choose.
It will usually vary on pump size, filter size, and total feet of head but a psi between 8-15 on a clean sand bed is pretty common.
15 inches without pump. 16 inches with pump
you woulds need to use a 12 x 25 filter
15 metres by 5 metres
The first pump fills (1/10th) of the pool in 1 minute.The second pump fills (1/15th) of the pool in 1 minute.With both running, they fill(1/10 + 1/15) = (3/30 + 2/30) = 5/30 = 1/6th of the pool in 1 minute.They have to run for [ 1 / (1/6) ]= 6 minutes in order to fill the pool.
In an olympic size pool, that is 15 lengths