Kingsley & Gasson Corner Development, Sydenham, Christchurch


67-69 Gasson Street, Christchurch


An innovative solution was required to treat 1150m2 of impervious catchment in a commercial carpark development, a site with a low 229mm driving head.

Stormwater360’s answer was to install the JellyFish® Filter - a compact underground filtration device coupled with LittaTraps to be used as pre-treatment.

The Jellyfish® Filter is our latest filtration treatment device and was acquired by Stormwater360 because of its ability to operate between 150mm – 457mm of driving head.

An effective and innovative stormwater treatment device, the JellyFish® Filter is a membrane filter housed in unique filtration cartridges. Each 69cm cartridge has 11 membrane “tentacles” with over 35m2 surface area; this high surface area enables the filter to achieve high flow rates at low driving head.

These tentacles filter and remove a high level and a wide variety of stormwater pollutants bigger than 2 microns. The pollutants of concern on this site were TSS, Hydrocarbons and Heavy Metals.

To maintain the cartridges, they can simply be rinsed and replaced, reusing the cartridge tentacles.

Restrictions on this site meant that the unit needed to be online, and the Jellyfish® was fitted with an internal bypass for flows greater than the treatment flow.

As part of a treatment train solution, two LittaTrap™s were installed in catchpits upstream of the JellyFish® for pre-treatment. By fitting these upstream, floatables and the neutrally buoyant material is captured, preventing potential loss in storm events larger than the JellyFish® design.

The LittaTrap™ is a very low cost ($350) pre-treatment device that can be hand-maintained, making maintenance simple and easy, and this, in turn, can extend the maintenance frequency of the JellyFish® Filter.


There is an initial inspection scheduled 12 months after install to ascertain maintenance frequency of the system.

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