If the floor of the pool is of uniform gradient then:
Pool bottom = 18' x 36' = 648 sq ft
Shallow wall = 18' x 3' = 54 sq ft
Deep wall = 18' x 8' = 144 sq ft
Two Sides = 2*{0.5*36*(3+8)} = 396 sq ft (they are trapezium-shaped).
Total = 1242 square feet.
Strictly speaking, if the pool is 36' long, the sloping length of the bottom is 36.35' (approx), so the pool bottom is 654.22 sq ft and the total is 1248.22 sq ft.
648 square feet.
18x36 = 648
18 x 36 ______ 108 540 ______ 648 gallons 18x36 = 648 square feet. Assume depth of pool 5 feet filled to brim, total volume 18x36x5 = 3240 cubic feet. 3240 multiplied by 6.22883 = 20181 UK gallons (rounded) 3240 multiplied by 7.48052 = 24237 US gallons (rounded)
That will depend on how deep you want the water to be.
26700 gallons
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tile size 18X36 and 1x2 what is the covverage of a 25# bag of grout
box = 18 x 36 x 3 = 1944 cu ft wedge = 1/2 x 5 x 36 x 18 = 1620 cu ft total = 3564 cu ft = 26661 us gal
Assuming brim-full, 30x3 = 90 ft2 30x4/2= 60ft2 90+60=150ft2 150x15=2250ft3 2250ft3 = 14014.8675 UK gallons 2250ft3 = 16831.17 US gallons Answer: area on top = (18x36) ft squared = 648 ft^2 vol of top section = 648x3 = 1944ft^3 vol of (bottom) diagonal section is: 0.5(36x18).(8-3) = 1620ft^3 total vol = 1944 + 1620 = 3564ft cubed 3564 (feet cubed) = 22 199.5604 Imperial gallons what I did was split the volume of the pool into two sections and deal with them independently as two separate shapes.
Just buying a frame that size can cost up to 40 or 40 dollars. Having the poster framed would generally cost you around 100 $.
You need a saltwater system. The unit converts the salt (NaCl) to chlorine gas (Cl) within a chamber using electricity then (almost) immediately converts it back again to salt. The cycle is continuous, therefore your pool water is 'sanatized' with chlorine whenever the pool pump is running - just a little bit at a time. Apparently the technology was first adopted in Australia 30+ years ago. I just purchased a unit in Canada for CDN$1750 installed for a 18x36 inground pool.
Normally liners are in between $800 and $1300 online for that pool. You can expect to pay a little more from a local retailer. Alot of people are doing this themselves these days, or at least ordering their liners online. If you pay your local retailer for the liner and labor, you can expect to pay about 2k- $2500 for this start to finish. This is assuming you need no bottom repair.You can do a search for inground swimming pools on Google, and look at the sponsored links. Most of those companies are very reliable and nicely priced._____________________________________________________________________I agree with whats said for the most part up top, but you have to remember that pools arent always true to their measurements. Just because you have a 18x36 inground and you can buy the liner online, doesnt mean its going to fit in nicely. Your outside diameter may be 18x36 but what about the ramp measurements? Slope measurements? shallow end floor to break point measurements? Deep end wall measurements? All pools are different. Just because you have a 18x36 or whatever size doesnt mean its going to look nice and wrinkle free. Yes it is more money to go through your local pool service but they come out, take lots of measurements of your pool so that the liner is SPECIFICLY made for YOUR pool. Plus your going to get a better warranty through a company that the pool company goes through that makes the liner and they know everything about that liner verse something you buy online. A lot of places now a days wont install a liner that someone buys online because they wont assume responsibility if something goes wrong with it. Honestly your better off contacting your local pool place and having them do everything and just pay the bill. Its a potentially safter bet in the long run.