Hello! I’m new and hope with your help I can feel more comfortable on purchasing RS aqualink vs RS 4. What would be the price difference if you know ? Just feels it shouldn’t cost 1k for 2 extra relays. I would really appreciate the answer. Thanks! I have pool and spa built right now and at the point to decide on the automation and seems like a very handy feature to control my pool, spa, 2 water cascades and light, oh yes and extra jets in the spa. The problem I’m having is the price difference! Please help!