Prior to fitting, infestation over a 6 month period on the prop shafts, props, rudders and propellers was so heavey that I had lost 3-4 knots off the top speed.  After cleaning down and installing your product and taking a trip down to La Rochelle and back, then leaving the boat in the marina for a couple of months, it was lifted out for inspection and both props and rudders were totally clean of all infestation, the only visible infestation being around the inner end of the prop shafts. … your unit is like Ronseal – it actually does exactly what it says on the packaging – so congratulations and well done on a product which does not disappoint!

Nigel Smeal, 9 October 2008