Hydrofast C300 RO Countertop Water Purifier, Iced & Sparkling Water Dispenser, 6-Stage Filtration with UV Sterilization, 5L Raw Tank & 1.5L Pure Tank, Adjustable Temperature & Volume, Smart TDS Display

Q: What is TDS?

A: Total dissolved solids (TDS), also known as the total amount of dissolved solids, is measured in milligrams per liter (mg/L). This indicates how many milligrams of dissolved solids are present in one liter of water. A higher TDS value signifies greater dissolved content in the water. Generally, higher electrical conductivity correlates with higher salt content and consequently higher TDS. Under extreme conditions, pure water is non-conductive, so its TDS value is 0. 

Q: Is TDS related to water quality?

A: TDS cannot definitively indicate the quality of water, but it can to some extent reflect its condition. TDS is merely one of several standards used to assess water quality.

Example: Adding 10g of milk powder to 300ml of purified water will cause the TDS to surge to 999. This merely indicates a high concentration of soluble solids present in the water and does not signify the presence of substances harmful to human health.

Q: What pH value does the water purifier display?

A: Under normal circumstances, the human blood maintains an alkaline environment with a balanced pH range of 7.35-7.45 to ensure proper metabolic function. It is recommended to consume water with a slightly alkaline pH, as this better supports bodily equilibrium. Our machine incorporates mineralization technology, filtering tap water into mineral-enriched quality water that produces slightly alkaline water with a pH value. Please ensure timely replacement of the filter cartridge.

Q: After replacing the water, can the remaining water in the original tank be used for the next filtration cycle?

A: Yes. Due to the reverse osmosis membrane's filtration precision of 0.0001 microns, a booster pump must pressurize the water to force the purified water through the filter. The concentrated wastewater, containing excessive impurities, is discharged via the waste pipe while simultaneously flushing the filter to ensure the longevity of the reverse osmosis (RO) membrane. This portion constitutes concentrated wastewater with elevated TDS levels. When prompted to change the water, the remaining water is highly suitable for watering plants and trees.

Q: What should I do if I intend to store the water purifier?

A: Step 1: One-touch drain. Press and hold the ‘-’ and ‘+’ buttons simultaneously for 3 seconds (tapping any button during drainage will stop water flow and exit the one-touch drain mode).

Step 2: Wipe the raw water tank and purified water tank dry. Remove the filter cartridge, wrap it in cling film, and store it in the refrigerator (not the freezer).

Q: Why does the water tank prompt for a water change when it still contains water?

A: This RO water purifier features a freshness reminder. If the user does not draw water and the purified water tank has not been used for over 24 hours (exceeding the 24-hour freshness period), the indicator light will illuminate brightly.

Q: Why does the newly purchased water purifier prompt that the source water needs replacing within five minutes of filling the source water tank, and why is no water dispensed from the purified water tank?

A: Upon receiving a new water purifier, its internal water pathways and filter cartridges are dry and will absorb most of the water from the source tank. Consequently, the first batch of source water will not fill the purified water tank completely in a new unit, which is entirely normal.

Q: What is the filter lifespan for this countertop RO water purifier?

A: All filters will eventually become ineffective over time. Their lifespan varies depending on the specific cartridge type, water quality conditions, and usage intensity. This purifier features a cartridge monitoring system that accurately tracks each filter's lifespan. It categorizes the remaining life of each cartridge into three distinct stages for intuitive, real-time display. The system will alert you before any cartridge expires, indicating when replacement is required. This effectively prevents water quality deterioration caused by delayed filter changes.

Q: What is the shelf life of the filter?

A: The filter cartridge has a shelf life of five years. Simply store it in its vacuum-sealed packaging in a cool, dry place without opening it, and you need not worry about expiry or similar issues.

Q: Why are there small black particles in the raw water tank?

A: Some users may notice black powder in the raw water tank during the initial water flush of a new unit. This is nothing to be concerned about. When a new filter cartridge is first opened and flushed, the activated carbon within the primary filter has not yet been fully activated. Consequently, some fine activated carbon powder may be discharged into the raw water tank. Activated carbon powder is non-toxic and harmless to humans. Its primary function within the water purifier is to adsorb residual chlorine, color, odor, and taste. Should this phenomenon occur, simply perform several flushing operations to resolve the issue.

Q: Why does the TDS reading from the testing pen differ significantly from that displayed by the water purifier?

A: The TDS measurement point on the water purifier is located at the RO outlet. Between this point and the final water outlet lies a third-stage filter. This third-stage filter, designed to enhance taste or add trace elements, will correspondingly raise the TDS of the purified water slightly. TDS serves merely as a reference value; any reading below 50 is considered purified water under national standards.

Q: Why does the water purifier display a pure water TDS value of 30 when operating continuously for over a week under normal conditions?

A: The national standard for potable water is a TDS level below 50, with values under 30 being suitable for direct consumption.

Q: Why has the TDS value of the source water decreased?

A: You may purchase food-grade citric acid online. Dissolve the bagged citric acid in warm water to form a liquid solution, ensuring no crystalline particles remain. Allow it to cool to room temperature before pouring it into the source water tank. Test whether the TDS of the source water has increased. If it has risen, this result indicates the monitoring system is functioning correctly.

Q: Why does the TDS value increase when purified water is poured back?

A: Our laboratory has conducted similar tests. First, we must understand what TDS value signifies; it refers to the quantity of dissolved substances in water. The higher the number, the greater the concentration. This product begins testing once water is added and the purification process commences. Theoretically, the displayed TDS value should match that of the purified water. However, after your machine has been in use, residual water with a higher TDS level remains within the internal pipes and filter cartridges. This residual water mixes with the newly added water, resulting in a detected TDS value higher than that of the added water alone.

Q: Why does the TDS value I measure differ from that indicated by the water purifier?

A: Firstly, this discrepancy relates to both the cup used to hold the water and the TDS testing pen itself. The cup may contain trace impurities, and the water may pick up minor contaminants upon contact with air during dispensing, leading to variations in the measured data. TDS test pens exhibit measurement inconsistencies; readings may vary between different models. We recommend using professional, certified TDS testing equipment. (National standard for direct-drinking purified water: TDS ≤ 50)

Q: When does the water purifier generate noise during water production?

A: To ensure your water safety, we utilize RO reverse osmosis membranes. Reverse osmosis technology forces water molecules through a membrane with pores four times smaller than the molecules themselves. Normal water pressure struggles to push molecules through, necessitating a booster pump to assist water flow through the RO membrane. Without the booster pump, our system cannot effectively remove harmful substances. Consequently, some noise during operation is entirely normal. Furthermore, the booster pump only activates when the water tank is producing water; it remains silent during regular operation, ensuring it does not disturb you or your household.

Q: Why do the TDS values of the source water and purified water appear similar?

A: The TDS value is closely related to the water source. We kindly request that you drain the purified water into the empty source water tank, then allow the machine to produce water to see if the TDS value decreases.

Q: Why is there water in both the raw water tank and purified water tank, yet the machine isn't producing water?

A: Step 1: Rotate and remove the filter cartridge; Step 2: Slowly rotate the base left and right 4-5 times; Step 3: Reinstall the filter cartridge, replace the machine's top cover, and wipe the countertop dry, and it will function normally.

Q: Why is the new machine not producing water?

A: Step 1: Switch on the power and wait for the machine to commence water production (the machine will emit a ticking sound). Once water production is complete, open the top cover of the machine and remove the filter.

Step 2: Using a tool such as chopsticks, gently prod the vent hole at the base of the filter to release trapped air. (Note: If resistance is felt when pressing with chopsticks, this indicates trapped air. At this point, the base of the filter may spray out gas and water. Therefore, when performing this operation, never point the filter's base upwards toward your face.

Step 3: Repeat Step 2 for the remaining filter cartridges. After venting is complete, screw the filter back in place, wipe the tabletop dry, close the machine's top cover, and it will be ready for normal use.

Q: Why does the water change indicator remain lit?

A: Step 1: Verify the original water tank is correctly installed.

Step 2: Check the TDS value of the original water supply; the issue may stem from poor water quality.

Step 3: Gently tap the micro-switch beneath the original water tank with a rod-like object several times to dislodge any accumulated water droplets from its surface.

Q: How to correctly position the original water tank?

A: Please position the original water tank correctly onto the base, pressing down until it sits flush without any gaps. Do not add water exceeding 100°C or any other unusual liquids to the tank to avoid damaging the original water tank and filter elements.

Q: Why is the water dispensing inaccurate?

A: Due to the water circuit design of the purifier, a ±10ml margin of error may occur when using the metered dispensing function. This is because a small amount of water remains in the water pipes, which is normal. We recommend using a measuring cup or bottle with precise graduations for accurate measurement.

Q: If there is an error in the measured water volume, will it be inconvenient when preparing formula for the baby?

A: As baby bottles lack a standardized measurement system, our water volume design uses the weight of water as the measurement standard. This ensures the measured water volume is largely accurate, with only a tiny deviation from the actual amount.