These filters are consistently ineffective. The manufacturer states up to 40 gallons or approximately 2 months for one filter. That's a lie. I track and measure every drop of water I drink. They barely last for 10 gallons which is about 2 weeks for me. Then the water flows through them so slowly that I can fill the jug before bed, and in the morning, 8 hours later, it's still not fully filtered. If it takes a whole day to filter a few glasses of water, they're practically useless. It would take