Waterdrop Chubby Water Filter Pitcher3-pack replacement filters are available for purchase! (search model: WD-PF-01A Plus)1. Caution: Before your first use, soak the filter in cold tap water for 10 minutes and remove bubbles to activate the filter and ensure the best filtration performance. Do not use a dishwasher to clean the product. Note that it is normal to find residual particles of carbon dust in the water while rinsing or soaking the filter. 2. Working and replacement method of indicator: During the first use, activate the gravity induct indicator by pressing the start button for 3-5 seconds until the blue light flashes. Reset the filter indicator life after every filter replacement. The gravity induct indicator is replaceable. Replace it by squeezing the clamping jaw. Make sure that the clamming jaw is inserted into the groove completely.3. Indicator light statuses introduction: The blue light of indicator will be on if the filter is in good status, the red light will flash 6 times if the filter needs to be replaced, and the red light will be on if the filter needs to be replaced at once.4. Long service life: For best results, change the filter every 3 months or after every 200 gallons (whichever comes first). This may vary based on the quality of your water.5. Not a TDS removal series: ?TDS? stands for ?total dissolved solids?; it is basically composed of inorganic salts and a small amount of organic matter. The filter can remove harmful substances while retaining beneficial calcium and magnesium, which are the main components of inorganic salts. We sincerely value your feedback. If you have any issues or require any clarification, please feel free to contact us! We look forward to serving you.