The constant programmable temperature humidity chamber is used to test the temperaure resistance and humidity resistance of materials and products, when doing humidity test, it need fill water, some users will choose running water in order to save cost, but using running water for a long time test, will have following problem for water system. 

1. Water scale is easy to appear in the water pipe, water cup, floating ball and other water system parts. 
2. The impurities in the running water will be adsorbed on the surface of the test products.
3. Water tank is not clean, and is difficult to clean with dirt.
4. The humidificatioin particles of ordinary water are relatively large.
5. If the humidity test is carried out for a long time, it will affect the service life of the humidify sensor. 

Here you will ask, what kinf of water should we fill in the water tank of temperature humidity chamber? 
Guangdong Yuanyao suggest using purified water and distilled water so as to protect and extend the service life of  the temperature humidity chamber.