It has been discussed there on Jambler's official chat group, the answer is below from the Jambler admin. So the same goes for all Jambler partner mixers who are using their default script.
But at the same time, there is a minimum of 0.005 BTC? So how can I mix my 0.0013 BTC? I don't want to send 0.001 BTC and keep the 0.0003 BTC dust. I want to go all in.