Self levelling latex screed

[Skyedriver]

Back again....
thinking about using a self levelling screed over the old and newly extended kitchen floor. All concrete just 50 years between them.
The last time I used self levelling screed it was cheapish one from a good DIY/Trade merchant. It worked but I was confused/surprised by the amount of sand left in the bucket every time I mixed/poured. Then had to scrape it out and spread it with a trowel. Is there a better quality one available that does just pour and level?

Floor about 5m x 6m, half old and half new. Probably about 2 or 3mm max except for a couple of narrow strips where timber was set into the old floor.
Thanks again

[Matt Black]

You can't go far wrong with F Ball screed, however if you want snooker table flat try K15 although you may need to prime the older floor first!