materials needed for making (lego type) concrete blocks

[lord mud of the flyes]

I ordered a 800KG bag of ballast and 6 bags of cement and had them delivered by Travis Perkins

AS SOME BRIGHT SPARK SOMEWHERE SAID THAT WOULD BE ENOUGH BALLAST FOR 2X 45 GALLON DRUMS

 

And I started the work. Well i have now run out of ballast!
I was told that an 800kg bag would do me 2X45 gallon/205 litres drums and it has only done 1 and 2/3rd of the drums. I am still 1/3 of a drum short!

[Onoff]

30 minutes ago, lord mud of the flyes said:

I am still 1/3 of a drum short!

 

Couldn't have put it better myself.