Thank you to choose FOISONTECH product very much,in order to ensure your balances and prolong lifetime of product,
please carefully read this product user service guide:

Foisontech solemnly promise to provide overall and scientific after-sale service as below:
1. For ozone cell  series provide one year free of charge guarantee.
2. For complete ozone generator series(excluding consumables and parts) provide one year free of charge guarantee and maintenance all the life.
3. For complete oxygen concentrator series(excluding consumables and parts) provide two years free of charge guarantee and maintenance all the life.

If product appear the following barriers,we will not undertake and guarantee against defects the duty :
1. If machine intake too much moisture or article leading to are damaged.
2. Change or tear down the product structure factitiously leading to the product damage.
3. Because of natural disaster or other force majeure leading to the product damage.
4. Can not provide the purchase proof reaches to guarantee against defects to block.