Sale! Feliway Optimum 30 Day Refill X 3 Value Pack | 48ml Optimum Refill 3 Pack
3 x 48ml Feliway Optimum Refill Vials (Total 144ml). Why Choose Feliway Optimum?. Covers Large Areas: Each 48ml vial covers up to 700 sq. ft. (. For maximum efficacy, replace the diffuser head every 6 months. ).