need to clear weeds from block paving

wilson1973

I have block paving to the rear of my house and need to get rid of the annoying weeds,could anyone advise me as to a product that wont break the bank I don't know if I should get a spray bottle or sachets which you add to the watering can,I tried the sachets years ago and they were pricey and did not cover half as much ground as they were supposed to,how long would I need to leave the weed killer to work before I could then use my jet washer and then apply kiln sand between grooves.
On a final note would using the jet wash dilute the weed killer and be counter productive although sometimes the weed killer can taint the blocks a little so I think it's a best idea to wash after and not before using weed killer

Burridge60

Large plunger and lance spray weedkiller costs about £25 lasts ages.

I bet you get pretty mucky with the jetwasher!

greatgimpo

If you use a jet washer on bricks, blocks or slabs (as you would do), they become rougher, so making rain water stay on them longer, so promoting dirt and algae growth.

wilson1973

Yes indeed I do get drenced and covered in dirt,I must admit I had noticed that once you have used the jet washer the blocks do get dirtier quicker.