Newbie here, Pool company recommendation was for Hayward SWG system that is rated for 40K gallon. From my limited understanding that Would be too small for our 20X40 pool. Should I ask them for Circupool RJ-60 plus or is a better option? They never mentioned anything about galvanic corrosion. Do I have ordered Zinc anode attachment or getting zinc rings in basket will be enough. Best place to order the SWG from? Thank you