EC on coco peat is a number from an extract, not a property of the dry brick. A 1:1.5 volume extract and a 1:5 extract read different figures on the same lot. A COA that prints “EC 0.5” without the method is decoration.
Washed and buffered lots on the 5 kg block are quoted against a named method — 1:1.5 or 1:5 — stated per lot. Unwashed is a separate grade on that page. The 650 g briquette uses the same floor language; it is a different packing unit, not a different chemistry.
If a receiving lab uses the other ratio, do not argue about the brick. Argue about the extract. How we read wash grades sits on Coir quality.