A telescoping handle assembly includes a first handle, a second handle, a first coupling member, a second coupling member and a driving member. The first tubular is secured relative to the second tubular while retaining the provision of fluid outlets to permit displacement of fluid from an annulus between the first tubular and the bore wall. The variable current source controller also controls a variable current source in response to an output signal from a comparator to minimize an output offset voltage, whereby a current flowing through the resistance element is adjusted to control the voltage at the output reference voltage input terminal. The system can also support a storm flow bypass that directs high-flow storm runoff water directly to the outlet to protect the filter system.