
Kate, I'd be asking how long the moult was lasting for and how much hair has your dog got left. I.e. is she going bald in places? The reason I'm saying this is that I had a shorthaired bitch years and years ago that wouldn't stop mounting all spring and summer and it was bad. Carrying bags virtually every day. The wind would blow her coat and a sheet of hair would blow off. It got worrying but she was a rescue dog and very nervous and after she settled and was put on a good diet, the moulting eased. In the years after that, she never moulted as bad again. Now in her case, I put it down to stress and malnourishment. (Please don't think that I'm suggesting that this is the case with your dog because I'm not) :-)
Not all GSD's moult all year round and not all of them moult in the summer. The dog I have at the moment has a hefty moult in the spring, normally over a period of two months (Carrying bags of it, daily) and then I have very little. He moults again late summer, early autumn. My bitch has been known to moult dribs and drabs all year round, but she doesn't have as big a moult in one go as my dog has in the spring.
At the moment I have very little hair round the house, but mine go swimming every week and I use the blaster as Val says to remove any dead hair. I also use a shedding comb and a rubber brush that Dill suggested to me and there is a lot less stray hair about this summer. In fact I have very little. I do actually groom mine every day, sometimes every two days; mainly because they enjoy it more than anything else and so do I for that matter. :-D
But the moult should slow down. I have yet to meet a GSD yet that lost bags of hair on a daily basis over a long period of time that wasn't contributed to some reason or another.