Intex 18-Foot by 52-Inch Ultra Frame Pool Set Intex 18-feet by 52-inches 1600 gallon; above ground pool; for the ultimate combination of pool filtration, salt water system, and convenience No other system on the market combines the gentle, thorough, environmentally-sensitive filtration and sanitation properties of sand and salt Easy maintenance as sand only needs to be routine backwashing and replacement every 5 years; salt never needs replacement under normal conditions For 6 plus ages person The 18-Feet by 52-Inches ultra frame comes with our krystal clear system