Measuring Guide

Signature Bullfrog Spas 25 Nature 2 Replacement Cartridge – Microban – 145 X 200

Dimensions:

A:  Diameter: 200mm
B:  Length:  145mm (not including spigot)
C:  Hole: Spigot ID: 51mm, Spigot OD: 55mm

Type: Open hole at top & coarse thread spigot on bottom. The open hole is for Nature 2 cartridges.

​How to properly measure your cartridge filter element?

A: Outer Diameter:  Measure the outside diameter of the end cap at the widest point. B: Filter Length: Measure the overall length of the cartridge including the end caps.  NB! Do not include any handles, attachments, etc. All measurements are taken from the outside of the filter. C: Hole (if applicable): Measure the centre hole as accurately as possible.