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Didymo (Didymosphenia geminata) is an invasive fresh-water algae, and a pest in several South Island Rivers. It has highlighted the threat that aquatic pests may pose and the huge impact they can have (and are already having) on river systems and paddling.

One drop of water containing a tiny but highly infectious didymo cell could spoil another river. Potenially, a drop falling off a boat being transported on a car/ trailer could infect a healthy river.

Check: Remove any Didymo matter from your kayak and gear (throw this on land away from river).

Clean: Put 10 or 20 litres of water in a tub (try the one you carry wet gear in).
Mix in 5% of household disinfectant.
10 litre tub: use 2 large cups (500ml)
20 litre tub: use 4 large cups (1 litre)
Drain boats and squeeze water out of wet gear as
thoroughly as possible.
Soak all gear in the tub for at least a minute, squeeze
excess solution back into the tub.
Pour remaining solution into kayak, slosh around to wet the entire inside (try to
get spillage from cockpit back into the tub or next kayak).
Drain from first kayak into the next and so on until insides of all boats are wetted
with solution.
Use remaining solution to sponge down the outside of kayaks and paddles.
Dispose of excess solution well away from river and if you have to rinse gear do
so in tap water not the river water.

Dry: If possible, leave your boat and gear to dry as an extra precaution. If you don't clean your gear you must dry all of it thoroughly and then keep it dry another 48 hours. Given the difficulty of completely drying wetsuit booties and other equipment, cleaning is preferred.

TIPS
Buy disinfectant from a supermarket for about $2 for a two litre bottle. If you
use 500ml it will cost you about 50 cents every time you clean your gear. A
small price to pay to protect our rivers!
Make a mark with a felt pen on the side of the washing tub to show the required
water level for future treatments.
It's a good idea to mark 250 ml and 500ml on an old plastic bottle (e.g. clean
one litre milk bottle) and use this to measure disinfectant.
Dial 0800 809 966 to report suspected new finds of Didymo or for more information.