The six things a pond kit leaves out
A pond kit covers the liner, the skimmer, the filter and the pump. Six more things are needed on almost every build.
Foam sealant keeps water running over the waterfall rocks instead of behind them. Dechlorinator treats the first fill. Starter bacteria gets the filter working. Netting keeps the first autumn's leaves out. Silicone seals the fittings. An automatic fill valve tops the pond up as it evaporates.
At list price the six come to $165.94: foam sealant $21.99, dechlorinator $14.99, starter bacteria $17.99, netting $34.99, silicone $15.99 and a fill valve $59.99. PondTools adds all six to the parts list for the pond you drew, sized for its volume.