WetSpot Heavy Duty
The Heavy Duty unit is perfect for boats 70'-100'. This unit will soften an average of 3200 gallons of average hard water (8 grains of hardness), before it needs to be recharged.
Considering "normal" usage, a WetSpot Heavy Duty will need to be recharged about every 2 months, this is an estimate and is based on washing a 70'-100' boat 3-5 times per week and filling your on-board fresh water tanks once.
Specifications: 39"L x 10.5" H x 7.25" D 45lbs. dry