Our original pond liner had been damaged by raccoons, and when Tim came out to inspect the damage he noted that our liner was not heavy duty and beginning to crack. We had also used a separate liner for the waterfall, which showed on the bottom of the old pond. Tim's new design for us used one huge, thick liner for both the waterfall and pond, and he gave us a curving waterfall that can be seen from the house as well as garden. The larger pump he installed does a much better job in circulating the volume of water, and the skimmer cuts down on our time netting leaves from the surface. A variety of stones were used to cover the liner and complete the natural look of the pond. We can't wait to add more koi and plants this spring! Tim and his crew were hard-working and got the job done in a (long!)day. Highly recommended!