Single-use filters are made for use with hydraSense® Nasal Aspirator, which is a gentle way to relieve your baby’s nasal congestion quickly and effectively when he or she is having trouble breathing. hydraSense® is the #1 choice of moms in Canada.* / *Source: Nielsen, National (DR + GB + MM) 52 weeks ending April 29, 2017. Based on combined sales of hydraSense Ultra-Gentle Mist, Easydose and Congestion Relief Kids.