My brother and I bought 2 yards of coarse perlite last spring for new raised beds. Worked great for that and also worked great for 25% makeup of soil blocks. It was sold as "screened luna rock" and looks like that pic of coarse above. The place sold a more uniform grade as well, but was sold by the 4 ft bags and cost a bit more that way. My first experience with perlite was was last year, so I am no expert.
I picked it up at the facility. The 2 yards came in a 300+lb bean bag that the forklift guy expertly loaded under the high rise cap on my pickup. It cost about $115 that way, and took some doing to unload and divide it up. The next day I returned an unopened 4 cu ft bag of perlite back to Agway and got my $24 back. It took more work, but I liked paying $2 per foot a lot more than $6 per foot. The screened luna rock was also a much nicer, "fresh" product with very low dust compared to the "horticultural perlite" I previously bought from Agway. I don't know what your options are for purchase over there, but here the local flower shops and big box stores were expensive compared to Agway, and Agway turned out to be expensive compared to direct from distributor.
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