X:30 is better than X:20.
It all depends on what you like. So this all depends on personal choice.
How many gallons of water for a 15'x30' swimming pool?
Is_x30_less_than_1
67'1"
8x30=159
x30
62" x 30" x 30" = 32.292 cubic feet. (rounded)
about 36'
15'x30'
15'x30'
The Phiten Tornado is Phiten's newest, greatest thing. Therefore they would argue that it is better than the x30. In my opinion, they both don't work but of course like many others, I own one. If I were you, I'd just purchase an x30 to save you money.
16X30=480 SQ'