One that is 3 ft 6 inches in length!
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Assuming your pool is round about 800 gallons.
1ft = 12in 3.5ft = 3.5 x 12in = 42in
w=8in l=13in
Anything you want, so long as (Length in inches)2 + (Width in inches)2 = 1,764
you subtract the largest mult. of 12 from 42 which is 36 and that is 3 ft then that leaves 6 in. 3 ft eaquals one yard so 42in= 1yd and 6in