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Hull Weed Removal

I'm sure this must have been asked many times but I'm hoping somebody has some advice.
My narrowboat hull was blacked 12 months ago and now has loads of weed. Does anybody know of a way of getting most of it off without taking the boat out and re-blacking?
I'm live-aboard so don't cruise much. Guess this is contributing to the growth.
Thanks in advance for any advice.

Asked by: chris meads  | 8.35am, Wednesday 5 June

WW says:

If it is any consolation, my boat suffers in the same way and probably for the same reason. It could also be something to do with how good the water in your canal is at supporting plant life.
I can't think of any way of removing it short of donning frogman's flippers and an aqualung. I would imagine that scraping at it from above is likely to do more harm than good.

Graham Booth  | 10.41AM, Wednesday 5 June

A broom with stiff bristles, or a nice long cruise.

Rupert Smedley  | 10.53AM, Wednesday 5 June

I suppose at the next hull blacking you could consider a long-term antifouling, but it is very rarely used on narrowboats- mainly as the surface needs excellent preparation, it often only lasts a year- two at the most; and would be exorbitantly expensive!
Also, the (usually copper) compounds leached out into the water are not good for aquatic life...
I would go for Rupert's suggestion: though if the weed growth is just around the waterline, then a pressure washer (domestic version) might remove much of the growth, though with the risk of taking paint with it!

Mark Langley  | 11.04AM, Wednesday 5 June

I have tried Mark's method with the high pressure water jet. I works quite well on the weed at or slightly above the surface but, as soon as you try to remove anything further down, you produce a lot of spray.
Some of this may be canal water in the form of very fine droplets so a mask would be a sensible precaution.
Another way might be to encourage the local duck population although this might not be welcome around 5.00am.

Graham Booth  | 11.24AM, Wednesday 5 June

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