You are doing a lot of work in the basement. Consider protecting the walls.
0.090 in. x 4 ft. x 8 ft. White FRP Decorative Wall Paneling (1-Pack)
interior use in restaurants, kitchens, regrooms, break rooms, and any locations requiring low-maintenance, washable walls. Made of a durable polyester resin and reinforced with fiberglass, these panels provide a nonporous wall surface that resists moisture, mildew, stains and protects wall from dents and scratches.
And salt. At least behind the tank. I splash a lot myself.
A plain white panel $40 each at Home Depot.