I have an SP-711 on my sand filter and I think they're pretty much the same. Had that problem with leaking to waste too. Quick fix is to add a PVC ball valve on the waste line and just close it when not in use. Proper fix is to change the spider gasket....some call it a wagon wheel gasket. There is a lot of debate on this forum about how to change it, that is the kind of adhesive if any at all. Somewhere I posted how I replaced mine and I used silicone seal to keep it in place. I'll try and find that thread. I had tried the Hayward recommended way using super glue and that didn't work too well as the leak started again. With the silicone it is over one season now and still no sign of leaking. If you're interested and go this route I'll pass along the details if I can't find that thread.
Al
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