Water Feature Knowledge Base - Need to Know (NTK) A Airlocks Algae Algicides Atmospheric Pressure Automatic Water Fillers see Poolmiser B Bacteria Back wash valve Installation Back Wash Sequence Cleaning and Maintenance C Cavitation Chemicals Chemical Feeders Concrete, Gunite and Shotcrete Cost of Running a OUT-OF-POND Pump D - E Drainage Electrical Installation Trouble Shooting Energy Conservation F Filter, Sand Overview Filter Operation Backwash Valve Filter Size Installation Add Sand Pressure Gauge Air Relief Valve Cleaning Sand and Laterals Fountain Design G Glues and Gluing also see Zen and the Art of Pipe Fitting Ground Fault Interruper (GFI) H Horsepower Hydrology I Impellor cleaning J - K Koi L Leak Detection see Leak Detection in Troubleshooting Repair Leaf Trap Liner Types Sizing Installation M - N Nitrification O Overflow Oxygen P Pipe Sizing Types Plants Poisonous Plants Pond Design see Pond Overview Pond Size Poolmiser Installation Operation Pump Sizing Location Installation Plumbing Wiring Wiring One Speed Wiring Two Speed Leaf Trap also see Zen and the Art of Plumbing Q - R Rebar Rocks S Salt Sand Skimmers Installation Two Port No Niche Soil Types System Start Up T Tank Fittings Trouble Shooting U Ultraviolet Lights Sizing Installation Underlayment Unions V Vacuuming a pond Valves Ball Check Jandy Three Way Venturi W Water Clarity/Water Quality Winterizing X, Y & Z Zen and the Art of Plumbing Zen and the Art of Beautiful Water