[mrs bouquet]

I only do feet, inches and yards, but I have managed to work out that the square metres of my patio is 61.87.
This is my next wet and forget project and the bottle says it covers 30 litres.  I can't work that out, far too difficult  So will this be enough to cover the patio, or will I need more.  Thanks, Mrs Bouquet

[JayG]

I'm assuming you've either bought an extremely large bottle, or that it makes 30 litres when diluted for use. 

Assuming it's the latter, what's missing is the number of litres per square metre you apply it at - the calculation should be quite easy if you know that. 

[mrs bouquet]

The bottle is 5 litres and it is, as you say, when diluted coverage.  It doesn't say anymore other than to cover.
When I did the front I used a can with a double drizzle bar, and just went over it so it looked wet, I didn't soak it.  So anymore advice will be appreciated.  thanks Mrs Bouquet

[JayG]

Wet & Forget is concentrated therefore dilute Wet & Forget 1 part to 5 parts water. Every 5 litre pack yields 30 litres of product to spray. With this you will get coverage of between 100 - 300 sq m depending on the porosity of the surface ie painted surfaces will use less but porous surfaces readily absorb the product and therefore coverage could be in the range of 100-150sq m. We recommend using a garden sprayer.

Source: https://www.wetandforget.co.uk/faqs/

Sounds like you've got plenty Mrs. B. - hope it works! 

[mrs bouquet]

Thanks for your answer.  I just cannot due modern sums  regards Mrs Bouquet

[Goosegirl]

I'm ok doing sums with litres as I worked in a lab, but wasn't with centimetres until I came up with this solution. Say you want to convert 30 centimeters into inches, divide by 5 then multiply by 2; so 30 divided by 5 = 6 and 6 x 2 = 12 inches.

[al78]

I'm ok doing sums with litres as I worked in a lab, but wasn't with centimetres until I came up with this solution. Say you want to convert 30 centimeters into inches, divide by 5 then multiply by 2; so 30 divided by 5 = 6 and 6 x 2 = 12 inches.

Or, slightly easier, divide by 10 and multiply by 4. Dividing by 10 is one of the most trivial calculations to do in your head, thanks to our metric numerical system.

[mrs bouquet]

Thanks for your sums tables.  I can do one or the other, but it is the conversions I struggle with, so thanks again. And to the gentleman in Horsham, would you like to pop down to Findon Village and do it for me    thanks again, Mrs Bouquet

[mrs bouquet]

Sorry, apologies, that should read to the lady or gentleman in Horsham !!  Mrs Bouquet

[JayG]

I'm ok doing sums with litres as I worked in a lab, but wasn't with centimetres until I came up with this solution. Say you want to convert 30 centimeters into inches, divide by 5 then multiply by 2; so 30 divided by 5 = 6 and 6 x 2 = 12 inches.

Or, slightly easier, divide by 10 and multiply by 4. Dividing by 10 is one of the most trivial calculations to do in your head, thanks to our metric numerical system.

Both are handy approximations, but don't use either if you're planning on building a space rocket (30cm is actually 11.811 inches.)  Lots of simple online calculators available if your project requires real accuracy, although spraying moss killer on a patio probably isn't one of them!   

[Goosegirl]

Dividing by 10 and multiplying by 4 is the same as dividing by 5 and multiplying by 2 (i.e. 10 divided by 2 = 5. 4 divided by 2 = 2). I agree it isn't mathematically accurate so please don't use this at home if you're trying to emulate Richard Branson by building a space projectile in your garage, though it could be useful if you don't take into the equation that you have enough door space to actually get it out! 

[Mr Dog]

I'm ok doing sums with litres as I worked in a lab, but wasn't with centimetres until I came up with this solution. Say you want to convert 30 centimeters into inches, divide by 5 then multiply by 2; so 30 divided by 5 = 6 and 6 x 2 = 12 inches.

Or, slightly easier, divide by 10 and multiply by 4. Dividing by 10 is one of the most trivial calculations to do in your head, thanks to our metric numerical system.

Both are handy approximations, but don't use either if you're planning on building a space rocket (30cm is actually 11.811 inches.)  Lots of simple online calculators available if your project requires real accuracy, although spraying moss killer on a patio probably isn't one of them!   

Altgough it would still give a much closer approximation than when someone at NASA confused Km with miles......

[Blackpool rocket]

I'm not going to expand the maths replies, but I am interested in how effective you're finding this product. I have been using a Karcha on our patio but it just doesn't shift the very stubborn patches of litchen, or whatever it is.
I've considered wet & forget for the past few years but am having trouble justifying the cost. I've tried pretty much every other method from household bleach to sulphuric acid with zero impact.

At the risk of causing another outbreak of outrage, any thoughts of posting some "before and after" pictures. It might be good to see some real results as opposed to the glossy brochure perfect images.....not that I'm saying that your results won't be perfect...etc...etc......or that you need to post any pictures to justify your use of the product. In fact if you're happy with the effect it has on your patio, that's absolutely fine.

I hope all is progressing well with your R&R

Br.

P.S. I've just remembered you've already said you've not grasped picture posting, it can be a bit of a hurdle, it was for me.
Perhaps there could be a thread for people to experiment with posting pics, just a place where non techs could try posting random images till they get the hang of it?

[mrs bouquet]

I have actually had a personal message from one of us, about pictures, to which I must reply.So maybe one day soon.
About W and F, So far I have only used it on the pebbles and cobbles at the front.  Unfortunately it hasn't rained yet, but I think I can see a very slight improvement.
I want to do my patio next, but other jobs keep prioritising, but I'll get there.  We have used a patio cleaning machine before, and didn't find it totally removed all the staining.  I don't want to really do that again, because it wears the surface away, and so makes it better for everything to get a hold.
I am assured by many folk that patience is the key with this product, (of which I don't have much) but its done now, so I shall wait and see.  Good luck, regards Mrs Bouquet