Product for holding tanks ?



What's the best 'product' for adding to nb holding tanks (apart from the
ruddy obvious human derivative additive !) ?

I'm sick (almost literally) of the pooey pong emanating from my huge holding
tank...the previous owner was very much against 'chemicals'....I'm not so
sensitive to the environment outside my nb, but IT STINKS !

Is it Elsan Blue...green...what ?

Go for the extra concentrated version or what ?

Any advice gratefully received.

--
le grand
nb Journeyman
www.iflexweb.co.uk/journeyman


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