This kit includes almost everything you need to build a pond. We call this the Advanced. The Savio SkimmerFilter is probably the best skimmer on the market today. If you desire UV clarification you can drop in a Savio UV Sterilizer (space for up to 2x26W or up to 2x50W UV units) - all with no retro fitting or cutting your piping needed. No other skimmer allows these inexpensive and convenient options. This water garden pond kit contains just about everything that you need to construct your pond except for the stone and water. With it you can build a pond up to 20 ft x 25 ft x 3 ft deep.