Indoor Pools - 0 - Indoor pools should never have stabilizer. In some very special cases we may add a little to help the ORP measurement but that is a very rare and advanced case.
Spas, Kiddie Pools, Small Water Features - 0 - Spas should never have stabilizer whether they are indoor or out.
Outdoor Pools - 20-30 PPM is ideal. Up to 50 PPM is OK. Never go above 50 PPM.