Sand:

To choose quality sand, you can try by taking a handful of sand in your hand and holding it tightly. If the sand is dirty, when the sand is released, dirt such as soil, grit, etc. will stick to the palm. Should not choose this sand or because of cost reasons to choose, you need to carefully screen before use. You can also pour sand into a glass jar and add a little water, stirring to assess the quality of the sand. Then the dirt will be obvious. Quality sand will not include grit, shells or dirt.