I have no complaints about products I purchased which are filters. I am very pleased with my Coldstream system and the quality and taste of the water are brilliant. Delivery tho is not. DPD is the worst possible choice for the delivery company. They do not leave parcels in a secure location leave. They left the parcel with my neighbor which I do not want. The worse was the parcel was damaged on the delivery. The way it was damaged suggested that someone split the edge of the parcel to find out if there is something valuable to take. Luckily filters are packed well in tubes so there were not contaminated. I wish Osmio use a different delivery company.