A Checklist for Construction of a Pond: Essential Items ...
Liner ... (45 mil EPDM Rubber)
Underlayment or padding ... (for added protection from roots and rocks)
Pump
Filter
Tubing and fittings for pump and filter
Stone
Electrical supply ... (for pump)
Pump screen
A good pond book
Optional Items ...
Plants, fish, snails, tadpoles
UV sterilizer (to cure green water; kills algae)
Water conditioner
Fountains
Water quality pH test kits
Fish food
Aquatic Tabs ... plant fertilizer
Pond thermometer
Bacterial concentrate
Barley bale
Underwater light