Seems things have changed substantially since I was involved in this area back in the mid 80's. (Just had a quick look on line.)
Back then hydro testing was done at 10 year intervals. Since then AS 1851 has come along and changed a lot. Though I did pull this of the CFA web site.
What is a hydrostatic test?
It is a pressure test that is performed on the fire extinguisher cylinder at either
three or
six yearly intervals from the date of manufacture or last hydrostatic test date as identified in Table 3.1 of Australian Standard 1851.1 (Level 4 service). This test is performed in conjunction with Level 1 & Level 2 services, and may be performed onsite or the extinguisher may be sent away to a service depot depending on the type of extinguisher.
Perhaps this is old info, pre the latest AS1851 changes?
Deano

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