If youre going to the glebe, you will have to take soft nets. Roy Marlow tests them by rubbing them on the back of his hand, if it's rough, then he won't let you use them on his waters. Just test them yourself before you go. The same applies to Mallory which are both run by Roy Marlow. 
if these waters really cared about the welfare of their fish you would have thought they would supply their own nets. that way as well as having soft nets they would also stop the spread of deseases from one water to another.