Next place another layer of sand on the bottom of the second liner. As you can see from the picture I used a rake to spread it evenly. It's a good idea to have a level when filling in the bog. Use it frequently.
Color As for what kind of sand to use I would recommend any all-purpose sand which can often be found at areas that sell sand for concrete mixing. For the amount you will probably need you may be able to get the sand very cheaply. Another place to find this kind of sand would be at a home-improvement store. The drawback to this is an amazingly prohibitive cost compared to wholesale sand.

Design - Preliminary - Pest Liner - Water Liner - Padding - Fill - Mixing - Planting One - Planting Two - Finished - The Bog: Early Spring 2002 - The Bog: Summer 2002