Replacement Aeration StonesAir stones can become clogged with mineral deposits which hamper their performance. Keep your portable aerator operating at peak efficiency by replacing the air stone on a regular basis.Features:High Output Air Stones quality aerationPremium Air Hose- includes 30 of tough non-kink air hoseIncludes aerator hose & 2 stones7 x 5.5 x 1.5