HOW DO I KNOW WHICH COCO IS GOOD FOR ME?

There are many variables to this answer, start with what you are trying to grow. Coco peat as a grow media can be used to grow all types of plants, and depending on the crop type, the quality of the coco to be used varies. That's why its important to know the quality or specs for the crop you are growing. Low EC coco is preferred by growers who want to be in control of the nutrients that feed the plants. 

WHAT ARE THE BENEFITS OF COCO?

Coco peat has high water retention properties, helps save water.

How to expand compressed COCO blocks?

Get creative with your expansion. There is no perfect amount of water required, coco is a natural material and hydration needs will vary. Give it a try and you will quickly figure what works best for you!

Method 1: Outdoors with yard space, spray water on the block/blocks and as they fluff, break it down with a shovel and keep spraying water till fully hydrates.

Method 2 (most common): Indoors with limited space, put them in a closed container, flood them with approximately 5 gallon/block, blocks will expand gradually, and once all water is absorbed stops expansion, add more water to expand the rest