The main differences between a plus sign and two plus signs of Sinoglass are as follows:

1. Version update: One plus sign is new and two plus signs are old.

2. Antibacterial effect: The antibacterial effect of the two products is the same, but the logo design of the two plus products has been upgraded on the basis of the old model, from "ag++" to "ag++", and nothing else has changed.

Generally speaking, there is no difference between a plus sign and two plus signs in antibacterial effect. However, which product to choose may need to be decided according to your personal needs and aesthetics.