2025 All-New 4 in 1 Tds Meter Digital Water Tester - Accurate and Reliable TDS EC & Temp(°C,°F) Meter - 0-9999ppm - Professional Testing for Drinking Water, RO/DI System, Aquariums etc

buy a water tester kit and see whats happening https://www.amazon.com/dp/B0CTHWS8GX?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

I have a cheap one from Amazon. https://www.amazon.com/dp/B0CTHWS8GX