You can increase TDS levels by adding mineral supplements, using TDS-boosting substrates such as crushed coral or mineral-rich gravel, and adjusting your water change practices, such as using tap water and changing water less frequently., The TDS reading is all to do with the exchange sites on the clays that form the substrates. They are exactly what they say they are "exchange" sites, ions will be exchanged along concentration gradients with the water., Aquarium substrate: The gravel or sand at the bottom of your tank can slowly release minerals into the water. Fertilizers and plant nutrients: Adding fertilizers to your aquarium can increase TDS levels. Fish waste and uneaten food: These organic materials break down in the water, releasing dissolved substances., Discover how to use a TDS tester effectively with easy steps on sample prep, calibration, and interpreting results. Essential guide for clear water quality checks., What is a good TDS value for a planted tank? Is a high TDS reading bad? What increases or decreases TDS in an aquarium? Is there an ideal TDS reading for a tank? This page explores how to make sure use of TDS readings in an aquarium - and explains in which situations it is useful., Learn how to use a TDS meter to measure the total dissolved solids in your drinking water, aquarium, or hydroponics system. In this video, we'll cover the basics of TDS testing, water.