Insert the nose into the air hole. Add in small quantities (2ml-3ml at a time). When refilling you want your sand to water ratio to be about 50:50. Keep a close eye on the sand level when injecting your refill liquid. If you have a lot of air present in your sand picture, you must withdraw air after you have add the Liquid Refill (** Caution: If you only add water and do not remove any air, it is possible for the glass to crack **). After adding the Refill Liquid (pure water), if you see any stuck sand particles, tap the frame to encourage the sand to move. Initially, it might be best to remove most of the air to get the sand to fall without resistance. Turn it over multiple times to see the sand fall freely. Once you see improvement in your sand picture, use your air scale, and add the proper amount of air.
Please note: Injecting too much liquid refill can cause the glass to break (pressure outward). Removing too much air when a sand picture is low on the liquid can also result in glass breakage (pressure inward).
When you think you have the correct amount of water added, here is a good way to confirm it. Lay the sand art flat on a table.
Remove the needle form the injector and insert the needle into the air hole.
If you see air coming into the sand picture, this means we need to add water.
If nothing happens, we have created the perfect equilibrium and the desired goal.
However, if you see after 10 seconds or so a drop of water escaping from the needle to the outside world, that means we added too much water.