Aqualisa Harmony handset
Try placing the head on a bowl of hot water, just the head part not the spray plate this hopefully will expand the head just enough to release the cartridge (Part 3 on the Drawing) If you hold the cartridge in the palm of your hand and turn the shower head this may do it.
www.showerdoc.com/aqualisa-manual-aquastream-shower-head-system-shower-spares
The other thing you can try is just popping the head in denture cleaner over night.
Answered 6 years ago by Barrie Seabright
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Aqualisa Manual Aquastream Shower Head System - Spares
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