If the depth is 6-ft everywhere ... no deeper places or shallower places ...
then the volume is
18' x 36' x 6' = 3,888 cubic feet
3,888 cubic feet = 29,084 gallons (rounded)
That's the volume of the pool, up to the rim. I have
no way to know how much water may be in it.
6m x 12m x 4.5m equates to 85,591.7 US gallons or 71,270 Imperial gallons.
96623.55072 gallons
1739
For this size pool, about 4,862.3 gallons.
240.56 gallons
8,258.494 gallons.
Assuming that the pool has an average depth of 4' , there would be about 11,760 gal.
It depends what concentration you need in the pool. If it's 0.1% - you need 4.5 gallons. For a 0.01% concentration, you need 0.45 gallons etc.
It is not possible to answer the question. A gallon is a measure of volume in 3-dimensional space. The question provides information in only 2 dimensions so there simply is not enough information.
How many gallons of water for a 15'x30' swimming pool?
A pool of this size can hold up to about 11,970 gallons of water.
A pool this size can hold up to about 5,250 gallons of water.
This pool can hold a maximum of about 5,707.6 gallons of water.
This pool, when filled with 4.5 feet of water, will contain about 15,300 gallons of water.
600,000 gallons
48,000 gallons of water
Is the pool a circle? Do you want US gallons, or Imperial gallons?
For this size pool, about 4,862.3 gallons.
The Shamu Close up pool is 1 million gallons