From the combination of warm temperatures and high propulsive water flow to the intimate bathing environment, a spa's filtration needs are very specific and fundamentally different in many respects from pool filtration. Spa and pool replacement filter cartridges have always been assembled using the same design and materials for both environments. As an industry leader in science and innovation, Pleatco has embarked on the successful research, development and creation of the world's first scientifically engineered premium filter cartridges for spas!