Abstract: An apparatus for producing a water feature in a spa/pool/hot-tub (“spa”) is disclosed. The apparatus includes a flume developer having internal dimensions that generate a water pressure from a water flow received from a water source associated with the spa. The flume developer further includes a head assembly having one or more apertures through which the water feature is produced based on the water pressure. The flume developer further includes a flange configured to abut against an outer surface of the spa. The flume developer is interchangeable in a water feature device body connected to the water source. A light source can be provided to illuminate the water feature.