Which aggregate to add to self levelling compound?

[NHW]

I have currently managed to get an offer which works out around £13 per unit if i take a pallet of this :

Ultra-Floor Levelling Compound - Underfloor Heating UK

We stock Ultra-Floor Two Part Self Levelling Compound for timber floors. Available for free next day delivery. Buy online or call for a free quotation.

www.underfloorheating-uk.co.uk

I roughly need around a pallet anyways so this works out great.

The only problem is that on the bag/sack it says 2-15mm depth, but i need something that can go upto around 20mm depth. I know it is only 5mm difference but i would rather stick to the manufacturers adherence of what they suggest.

But then on a seperate image which is still on the same product listing it shows something saying:

30mm - consumption per 10m (squared) area = 19.2 bags + 8.1 x 10kg Units aggregate.

Does this mean that i can use this product at upto a 30mm depth as long as i add the right amount and specification of aggregate to it?

and by aggregate i am assuming that it is roughly a 1:1 ratio of clean sharp silica sand? just trying to figure out if it is any different from the water-mix SLC to this Latex Bag-and-bottle SLC, in regards to adding the aggregate. Any advice at all is much appreciated. Thank you

 

[dazlight]

We use limestone 6mm aggregate.
id use a latex bag and bottle though as it’s moisture tolerant

 

[NHW]

Ahhhhh yes we will be using the bag & bottle latex stuff.

In regards to the limestone aggregate, because it's for internal use will it leave lumps/bumps? Because I need to lay LVT flooring over the finished Screed/SLC

Or is it a case that I would put down a bed of the aggregate first and then pour the SLC over that?