Developed for Whirlpool Systems.  Simply dissolve tablet in bath water post bathing to sanitise whirlpool.  Full instructions on pack.  This is a home use product for bathroom sized whirlpool baths.  After bathing, ensure water is above the jets - add a chlorine tablet, allow to dissolve then pump around the system for 5 -10 minutes.  Drain water as normal afterwards.

To keep pipework & filters free of biofilm build up, we recommend using Pipe Filter Degreaser.

http://www.maclingroup.co.uk/Pool-Chemicals/Whirlpool/View-all-products.html

Or go to Pool Chemicals - Whirlpool