I have had alot of customers ask me about the type of ice to use, and if ice affects texture. Normally for people who makes shave ice for home use, I would recommend them to use home made ice. Home made ice like the name states is ice made from molds and freezed in your freezers. However if you plan to make shave ice commercially I would normally recommend commercial block ice from a ice factory. Commercial block ice is recommended because:
1.) Sanitation- Ice houses are required to have a certain standard regarding sanitation. For example, Honolulu Ice Company follows a multiple point inspection on both their equipment and ice for any possible contamination before the ice is sold. This process is very important because not only does it provide health safety for your customers, it also affects liability. If any customer gets sick from eating the shave ice, and the ice was found to be the cause, it would be the ice house which will be held responsible rather than yourself.
2.) Hardness- Commercial ice is generally freezed more solid than home made freezer ice. A more solid block not only means that the ice is able to last longer outside the freezer but also reduces its chance of cracking while shaving, which causes alot of wastage.
3.) Water- When your ice is bought commercially, it should be made with filtered water. Filtered water is generally softer than tap water which will affect texture to a certain degree.