Abstract: In some embodiments, the invention provides an apparatus configured to deliver dispersant into the water in a filterwell of a hot tub. Methods for delivering dispersant into the water in a filterwell of a hot tub are also provided.

Abstract: In some embodiments, the invention provides an apparatus configured to deliver dispersant into the water in a filterwell of a hot tub. Methods for delivering dispersant into the water in a filterwell of a hot tub are also provided.

Abstract: In one general aspect, an apparatus includes a probe including an exterior probe element including a first plurality of links defining a first flexible element. The exterior probe element defines a guard ring. The probe also includes an interior probe element including a second plurality of links defining a second flexible element and disposed within at least a portion of a perimeter defined by the exterior probe element. The apparatus includes a waveform generator electrically coupled to the exterior probe element and the interior probe element.

Abstract: In one general aspect, an apparatus can include a probe including an exterior probe element including a first plurality of links defining a first flexible element. The exterior probe element can define a guard ring. The probe can also include an interior probe element including a second plurality of links defining a second flexible element and disposed within at least a portion of a perimeter defined by the exterior probe element. The apparatus can also include a waveform generator electrically coupled to the exterior probe element and the interior probe element.