What is the best length of subline to use for carp fishing, preferably one that can be used universally with the carp

The best subline for carp fishing is on the long side.25-30cm is good. Carp in addition to the northern winter, early spring subline number should not be more than 0.6, the length of 15cm or so these two requirements, the other seasons of the subline length requirements are not high, generally in the 8 cm or so can be on the fish, and the signal is sensitive.