My gf had a salt 30' foot round when we met. I found the supply was barely filling the pump basket and if you put a skimmer plate and hose in it bare has suction and the clear pump lid shows water about 1/3 down. At the same time the return is strong. I replaced the pump with the 1.5 hp Pentair Dynamo that is recommended and was on there originally. I also replaced all the PVC and valves with new. Still have a weak supply side and strong return. None of this makes any sense to me.
I have an inground with a Hayward superpump and 4 returns, so this is all new to me, but there is something wrong here on this above ground.