RO troubles (not as painful as it sounds)

Last night I was woken up by night watch at 11.50 as the alarm was going on the RO plant, the reverse osmosis plant produces all our drinking and washing water, so as you can imagine it is very important.

I was up till 3am taking and testing water samples from each set of membranes, pictured above they work by magic as they remove the salt from the seawater which then gives us pure water.

The tests proved that two of the membranes were faulty and the rest were on the way out so I replaced them all.
Another job well done.