French drain shingle

[Mojooo]

I need to build a french drain to move water away from foundation of a house.

I was ordering a skip and so bought some recycled 20mm shingle from the same place. It was advertised as being free of 'fines' and suitable for drainage. I expected to get stones with no small bits.

What I got was this - http://1drv.ms/1w9SAqn

Its a mixture of small stuff and big stuff (simialr to MOT type 1).

Is this stuff suitable for french drains? The very small bits look like they will cause things to clog up.

Remedies are to get new stuff or I could potentially wash the small bits off or put the big ones through a filter.

If the advert says 'no fines' does that mean you don;t get the smaller stuff or are fines something else like soil?

[Mojooo]

It is supposed to be 20mm

Essentially as long as all the pieces are big (over 20mm) then I doubt it matters hugely.

The stuff I bought is recycled which is why it doesn't look so nice.

But yea, I reckon the stuff they sent is not suitable.

[Mojooo]

I paid 24quid for 2 tonnes.

so I can sue it for a base for a footpath/s? If so not the end of the world - but will have to re-order clean new shingle I guess.