I have laid my 18m sq natural slate patio, cleaned it and sealed it once, using Fila products.
I started grouting using BAL grout and a motar cartridge gun (which makes the job so easy and less messy)
I have had real problems cleaning the grout off the slate, its was very hot so the grout was drying fast but I was only doing small areas at a time. It took me ages to get all the residue off the slate. I was using a sponge and a scouring pad and changing the water often.
I was quite concusous about getting to much water on the tiles and washing the grout out of the joints, is this where I was going wrong, should I of used more water.
Anyway I still have 75% left to do and have already used 10kg of grout.....!!!!
Any advice would be greatly appreciate.............