I would like to know how many gallons of water there are in a pool depth1ft 7ins length8ft by 3ft 9ins wide

Formula For Average Gallons In Rectangle, Square Or Freeform Pools:
Length x Width x Average Depth x 7.5 = Total gallons
Formula For Average Gallons In Circular Pools:
Diameter x Diameter x Average Depth x 5.9 = Total gallons
Formula For Average Gallons In Oval Pools:
Length x Width x Average Depth x 5.9 = Total gallons
Formula For Average Depth Of Pools With Slopes:
Shallow End Depth + Deep End Depth Divided by 2 = Average Depth

the volume formula is what is used to determine the amount of water in a tank
that is length X width X height (depth) that determines the cubic capacity or the tank
now 1 cubicft = 7.48 gallons
so as an example-- a fish tank 3ft X2 ft X 2ft = 12 cubic ft =12 X 7.48 = 89.76 gallons

What you looking to know?

Square feet suggests a flat area, like the floor plan of the pool, which would be 16 x 32 = 512 square feet. Like you'd measure walls for tiles or paper etc.

As you've given 3 dimensions, sounds like your after the cubic capacity/volume of the pool, in which case your looking at cubic feet (same as flat area above, but with the added depth to go from flat 2d, to 3d (2 vs 3 dimensions)), which would be 16 x 32 x 10 = 5,120 cubic feet.

Sounds like the aquarium is a 25 low.

Approximately 15,300 gallons assuming the 4' depth is pool bottom to waterline.

What you appear to be asking is the volume of your Pool in gallons! Here is the formula and resulting answer:

Length X Width X average Depth X 7.5 (for rectangluar) (or 5.9 for a circle or oval)

You need to know 3 values:

The overall length in feet (assuming 42 on your note)
The overall Width in feet (assuming 16 on your note)
The average depth, take a depth measurement at 3-4 locations equally apart along the length from deep to shallow (or vice-versa) (example might 8ft, 6ft, 4ft, 3ft) add these measurements together and then divide the total sum by the number of depth measurements (example 4) this will be the average (example 5.25)

So the resulting formula would read 42 x 16 x 5.25 x 7.5 = 26,460 gallons for the example

So if your pool's average depth is about the same, then your volume is rounded to about 26,500

Your shock product should clearly state how much one bag will treat a given volume (example 10,000 gals) for regular treatment or shocking. Usually shocking involves doubling or even tripling the normal maintenance dosage, but check the product labels and instructions for manufacturer's recommendation.

Depends ... 15 feet round? 36 inches deep? = 3976 gallons

15 feet by 36 feet rectangle, how deep? if 5 feet deep = 20,250 gallons

Hope this addresses your question.

Thanks for your interest in FixYa.com

When checking functionallity of this heater heres what we need to look at.
Your pool is 6660 gallons with a 55,000 btu pool heater.
Right off the bat I can tell you that this heater is meant for a spa or small pool only.
Depending on where you are located this heater will not even keep up with heating this water in cold temperatures. You should have a 100,000-150,000btu heater installed for this pool.

Since this is what is installed, here it goes.
Make sure there is adequate flow to the heater. All heaters have a recommended flow rate which is more more productive than one that is too fast or too slow. Ideal for this heater is 55-65 gallons per minute, so make sure that the pump is not clogged and flowing freely.

Also, if this is an old heater and hasnt been serviced in quite a while, then the heat exchanger is probably overdue for a cleaning. When the heat exchanger gets dirty, all that heat produced by the burners just gets vented instead of heating the water. a yearly service is highly recommended on these low efficiency heaters.

By the way, you have a 55,000 btu heater that was 81% efficient the day it was installed.
This means that the actually heating btu's is already down to 50000.
the efficiency of these units will go down 2% a year if serviced, and about 3-5% a year if not serviced.

Long story short, the heater is undersized, and probably also needs to be cleaned.

How many gallons of water are we discussing? #40 would be about enough for 1800 gallons? (guessing)

It should say on the bag what the aplication rate is. Had you provided the gallons or had you given the size of yor pool, I would have calculated it for you.

Post the info ... and I will calculate for you ...

Do the families have the proper permits to add water to the public pool? If not should the time to acquire the permits be considered ?
Secondly, What is the temperature of the water coming out of the hoses, as cooler water will expand and fill the pool faster.

Considering all of the unknowns we can not solve for Time. Do you know how much water the Baxters are delivering to the pool? It appears they did not pay their Water bill.

Pool=302,000
Gilberts=G=(B/12)*92/H
Baxters=B
Sings=S=85gallons/H

Time=302,000/S+B+G/H