RicoRock now is offering an improved system for installing structural grottos and caves on pools. The Component System uses lightweight boulder columns. The columns come with a sandwich-type Grotto Lid. The system can be used for waterfalls that overhang a seat to swim-in caves. Prescribed areas are backfilled with concrete for structural strength. The design is equal to, or better than, custom work at half the time and expense, according to the company. Contact: RicoRock Inc., (888) 717-3100; www.ricorock.com