You can use Salin Plus in humid environments so long as your room is well insulated from the moisture outside. Avoid leaving your windows open when the humidity levels are high. Use a hygrometer to measure the relative Humidity level, try to keep it around 50 to 60%.
We do not recommend using Salin Plus in a damp room, as the salt filter absorbs the moisture in the air. You would be amazed how much moisture is in the air when the room is damp. If the salt crystals absorb this moisture, they act like a sponge and ultimately can leak the water it has absorbed. The salt crystals are much more effective when dry.
We have seen this issue in around 1% of cases, typically in countries where it can get very humid at certain times of the year. It comes down to the level of moisture in your home, which will vary depending on the structure of the home, and type of ventilation and air conditioning used.
If your home uses an evaporative air conditioner which emits moisture into the air that can cause moisture issues for the Salin Plus filter, whereas other types of air conditioners help to dry out the room and therefore help reduce the risk of any moisture issues.
The best way to protect your filter, is to remove the moisture from the air, and the best way to do this is with a dehumidifier. There are many different brands on the market to chose from. They are popular as they help reduce dust mite activity and mold spores which also effect respiratory conditions and no one likes a damp home.