Regarding TDS, it is not a professional way to test water quality. TDS stands for Total Dissolved Solids. For example, if you add a small amount of salt (NaCl) to the water and test the TDS, the result will be dramatically high. Similarly, if your water is full of minerals, the TDS will also be high.

The under-sink water filter does not remove minerals from the water; it only removes heavy metals such as Lead, Mercury, Cadmium, over 70-80 VOCs, and significantly reduces chlorine. This is why the TDS level may not be as low as you expect.

The TDS meter is commonly used in reverse osmosis (RO) systems. If the RO membrane is not performing well, the TDS will be higher. A significant increase in TDS means it is time to replace the RO membrane. Therefore, please do not use TDS to test water from any source except for a Reverse Osmosis system, as the result will be meaningless.

You got great feedback, and we want to congratulate you on the cloudy water. It is completely normal for the water to appear this way, as the bubbles are formed by the filter. The filter cartridge has a precision of 0.5 microns or even less. As water passes through the tiny holes, it forms micron-clustered water, which makes the H2O at that moment the best, especially at the beginning. This is common for Reverse Osmosis water systems. It's great that this happened to your system after a proper rinse. If you let the water sit for a while, the bubbles will disappear, and the water will turn crystal clear.

After a few days of use, this phenomenon will disappear, as the carbon cores will settle into their normal state. We always aim for the water to be like it was at the beginning, as that’s when it is the best.

We are afraid that you can't run hot water through the filter system, and almost every water filter for drinking can't use with hot water. The high temperature of water coming through will damage the mechanical part of the system. The working temperature for all those systems is limited to 39℉ ~ 100℉.

Please help us with following troubleshooting to check if the filter is clogged. Remove the three filters one at a time, and observe whether there is any change in water pressure after each removal.

For example, if you remove Filter A and the water pressure returns to normal, this indicates that Filter A is clogged.

M800 is positioned as a non-electric tankless reverse osmosis system. Instead of relying on an electric pump, it uses household water pressure to drive the filtration process, helping reduce pump noise, electrical hum, and under-sink wiring needs. This makes it a strong fit for users who want quieter RO filtration with simplified installation.

No. M800 uses a tankless design and does not require a traditional under-sink storage tank. Water is filtered on demand instead of being stored in a pressure tank, which helps reduce cabinet clutter and stored-water concerns. This design is better for kitchens where space-saving installation is a priority.

No. M800 does not require an electrical connection for daily RO filtration because it runs on household water pressure. It can continue providing filtered water during a power outage as long as sufficient water pressure is available. The required pressure listed in the MD is at least 50 psi for proper operation.

Yes. M800 includes a remineralization stage designed to add selected minerals such as calcium, magnesium, and zinc after reverse osmosis filtration. This helps improve the taste profile of purified RO water.

M800 is designed with a 4:1 pure-to-drain ratio, meaning it produces more purified water compared with wastewater output under typical use conditions. Actual performance may vary based on feed water quality, pressure, temperature, and filter condition. This makes the ratio a water-efficiency feature, not an absolute guarantee in every home.

M800 is designed for up to 900 GPD high-flow output and can fill a cup in approximately 5 seconds under ideal conditions. This makes it suitable for busy households that need RO water for drinking, cooking, and daily hydration. Actual output can vary depending on water pressure and installation conditions.

Before installation, check both cabinet clearance and water pressure. The MD lists the system dimensions as 14.5” × 5.1” × 19.7”, with a minimum cabinet height of 19.7 inches and water pressure of at least 50 psi. These details should be verified before purchase to avoid fit or performance issues.