Water hardness falls into two categories: permanent hardness and temporary hardness. Permanent hardness does not influence water’s taste or how household appliances work. Temporary hardness affects the taste of food and beverages prepared with hot water. Further, it causes limescale deposits in home appliances that heat water, such as kettles, steam irons, coffee makers and washers.
By reducing water’s temporary hardness, our water filter cartridges reduce taste and aroma impairing substances and limescale build-up. The result is great tasting water for hot drinks and dishes prepared with water, and less lime scale build-up in home appliances. How hard is your water? Order a free water hardness test strip to find out.

Purithm reverse osmosis water filter system adopts advanced composite filter technology. The composite filter can intercept most harmful contaminants.
(1)TDS, chlorine, taste and odor, chloramine, scale, turbidity.
(2)Carcinogens: chromium (hexavalent), chromium (trivalent), cadmium and cadmium compounds, ferric oxide.
(3)Heavy metals: lead, mercury, barium, copper, radium 226/228, aluminum.
(4)Micro organic contaminants: cysts.
(5)Inorganic pollutants: arsenic and inorganic arsenic compounds, fluoride.
(6)Organic pollutants: asbestos, benzene, formaldehyde, trichloromethane, chlordane, PFOA & PFOS, etc.

The process of reverse osmosis does not make the water unhealthy in any way. Rather, the purification benefits may protect you from many water-borne contaminants.

Yes, this machine can be used with hard water, and the TDS reduction rate will be 90% and above after complete flushing. But we do not recommend using it as a source for the RO system directly, you can install a pre-filter first, like Reusable Whole House Spin Down Sediment Water Filter.

Tank reverse osmosis system holds reverse osmosis water so you have plenty to use when you need it. A traditional tank reverse osmosis system makes water slowly. It takes one minute to produce two to three ounces of RO water. If you were to turn on your faucet for a glass of water at the actual membrane production rate, then you would have to wait at least 5 minutes for it to fill. Waterdrop tankless reverse osmosis system has overcome the issue of bacteria colonizing in the bladder tank. With no storage tank to fill, Waterdrop tankless reverse osmosis system does not run until RO water is needed.

The TDS pen is a tool for quickly detecting the total dissolved solid content. Because the reverse osmosis machine removes 90%-98% of the dissolved impurities in the water, while the ultrafiltration machine filters the particulate impurities, suspended solids, colloids, and other substances in the water, retaining the dissolved substances in the water including calcium and magnesium ions. Therefore, the data measured by the TDS pen is no different from that of tap water and may even be higher than that of tap water.

The World Health Organization (WTO) Drinking Water Quality Criteria: There is no specific PH index specified, but it is added that low PH has a corrosive effect; high PH affects the taste, with a soapy smell; in order to make chlorination more effective, PH≤8 is preferred. The Drinking Water Quality Standards of the US Environmental Protection Agency (EPA): There is no specific index for Class I water; for Class II water, PH=6.5-8.5 (that is, both acidic and alkaline are allowed, which is relatively宽泛) The Drinking Water Quality Standards of the European Union (EC): PH=6.5-9.5, the minimum value of PH for bottled or barrelled pure water should be reduced to 4-5, and for bottled or barrelled natural water rich in carbon dioxide or artificially filled with carbon dioxide and water, the minimum value should be reduced even further. This restriction on the minimum PH is relatively strict and cannot be high. The Drinking Water Quality Standards of Japan: The PH value is 5.8-8.6, and the lower value is wider. GB5749 Domestic Drinking Water Health Standards in China: The PH value is 6.5-8.5; GB17323 Bottled Purified Drinking Water: The PH value is 5.0-7.0, which is consistent with the standards of developed countries in this regard. Conclusion: 1. Water that meets the standards can be consumed, and there is no such thing as drinking acidic water or alkaline water is good. 2. Stomach acid is a strong buffer solution, no matter what water is drunk, the PH in the stomach will change to acid.

Step 1. Wash your hands, then remove filter from filter box.
Step 2. Please soak it in cold tap water for 10 minutes to remove bubbles before use to activate the filter and ensure the best filtration performance.
Step 3. Please hand wash the pitcher, dispenser, lid and reservoir with a mid detergent. Don’t put it in the dishwasher. Do not use abrasive cleaners rinse thoroughly with water.
Step 4. Install filter into reservoir. Press firmly to ensure a tight seal.
Step 5. Fill the reservoir with cold tap water. Discard the first two times filtered water.
Step 6. Press the button for 3 seconds until the blue light flashes to activate the indicator.Note: Repeat this step after each new filter replacement.

1. The principle of the TDS pen measurement is to indirectly reflect the TDS value by measuring the conductivity of the water. Physically, the more dissolved substances in the water, the higher the TDS value of the water, and the better the conductivity of the water, and the higher the conductivity. 
2. The factors affecting the TDS value include: 1) the impurity content in the water; 2) the temperature of the water (the higher the temperature, the more active the ions); 3) the drop in the electric field in the water (the battery power of the TDS pen); 4) the water flow rate. 3. Ultrafiltration machines commonly use ultrafiltration filters, PP filters, etc. The filtered water is called purified water, which mainly removes sediment, rust, colloid, bacteria, viruses and other substances in the water. If there is an activated carbon filter, it can remove residual chlorine in the water. 4. The ultrafiltration machine cannot filter out the ion content in the water, that is, the number of conductive ions remains basically unchanged, but the impurities mixed with or wrapped around the ions are less, so the activity of the conductive ions is enhanced. Conclusion: It is normal that the TDS value of purified water measured is similar to or even higher than that of raw water, and the temperature also affects the TDS value, the higher the temperature, the higher the TDS.

Unused filter elements: Unused original filter elements should not be unpacked. It is best to store them at a low temperature of 5-10 ℃. When storing in an environment with a temperature exceeding 10 ℃, choose a well-ventilated place and avoid direct sunlight. The storage temperature should not exceed 35 ℃. Avoid storing in a humid environment and avoid water ingress. Meeting the above conditions, the new membrane element can be stored for about 3 years to ensure its service life. If the reverse osmosis machine is not used for 3 days after installation, it is necessary to turn on the faucet to drain and flush. Do not supply water and electricity to the newly installed machine under unused conditions.

One possible cause for an apparent leak may be overfilling. Water may overflow into or over the handle when you pour resulting in what appears to be a reservoir leak.
Your satisfaction is very important to us, We offer No Worries Guarantee and a 30-day money-back guarantee in case the products get damaged.
If the problem cannot be solved, please feel free to contact us

1) Chemical changes in the membrane itself: hydrolysis of the membrane, oxidation interference of free chlorine and active chlorine
2) Physical changes in the membrane itself: compaction of the membrane, which reduces the water permeability and increases the desalination rate; membrane contamination: fouling, microorganisms, and solid particles on the membrane surface or inside the membrane.

1) Do a good job of pretreatment of raw water to ensure SOI < 4, and add bactericides to prevent the growth of microorganisms;
2) Maintain a suitable working pressure during RO operation. Generally, the water output increases with the increase in working pressure, but too much pressure will compact the membrane.
3) The flocculent state of concentrated water should be maintained during RO operation to reduce the concentration polarization of the solution on the membrane surface and avoid the precipitation of insoluble salts on the membrane surface;
4) When RO is shut down, it should be flushed with chemicals in the short term, and CH2O protective solution should be added for long-term protection.
5) When the RO water output is significantly reduced or the salt content increases, the surface is scaled or contaminated and chemical cleaning should be performed.

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If you have a coupon that is not working and you don't know why please contact us via Live Chat at the lower left corner or contact us.

Yes. However, we already offer generous discounts to drop shipping customers, so it may be more advantageous to use the drop ship discount rather than the coupon.

Purithmaccepts PayPal, Credit Card and Accelerated checkout. Please read the Payment Poilcy to learn more payment information

Purithm does not charge fees of any kind, but some credit card companies will charge a currency conversion fee. Please consult your credit card provider for more information.

Please verify that your payment is confirmed.  If the issue is still there then please contact us or email to us with your order information.

There are three reasons why your order was partially shipped：
We have different warehouses, we will not combine them together and will ship from the correct warehouse separately.
The items are overweight and need to ship in different packages.
The item is out of production or stock for a long while, we may ship the rest to you first.
Usually in this case, we will send email to you.
Please read the Shipping Policy to learn more information.

If the order has already been paid but is not shipped out yet, you can contact us to cancel the order in 24 hours and get a full refund. Usually the item will be shipped in 24 hours!
If the order has already been sent out, we cannot help you to cancel the order. You may choose to send back the unopened products after you've received them and we will refund the money upon our receipt of the returned item(s).
Please read the Return & Refund Policy to learn more information.

Once your order is shipped, you will receive an email from us containing the tracking information. Tracking information is also available in your "Order Details" page.

If you choose Ground Shipping, then you do not need to pay for shipping cost, if you choose Standard Shipping or Express Shipping, you need to pay the extra shipping fee.

If the payment page displays an error, please kindly try to reorder. And if the same thing happens, then please contact Customer Service for help via Live Chat or email

If you wish to cancel an order, please contact our customer service team.

If you contact us within 24 hours of purchase:
We can cancel the order for you at no additional cost. The cancellation may take up to 3 days, thank you for your patience and understanding.
If the package is already shipped, we will issue a prepaid label and return your payment AFTER we have received the package from you.

If you contact us after 24 hours of purchase:
You need to bear the return fee if the package is already shipped (depends on our system, not the order status).
The product has to be damage-free, packed in the packaging we sent to you, and with the original receipt of the purchase.
We will return your payment AFTER we have received the package from you.

There are times when we may not have the product(s) that you choose in-stock or may face some issues with our inventory and quality check. In such cases, we may have to cancel your order. You will be intimated about it in advance so that you do not have to worry unnecessarily about your order. If you have purchased via online payment (not Cash on Delivery), then you will be refunded once our team confirms your request.

After receiving your request or your packages, it may take up 5-10business days to refund your money.
Thank you for your patience and understanding.

If you received a damaged / incorrect item and you want to file a claim, please send us email ,together with your order information and the picture of the damaged / incorrect product.
If you want to return the item without any quality issue, you need to bear the return fee yourself and pay 20% of the original order as a restocking fee.

Distribution Program
Become our distributor to get the best price, priority to new products, and unlimited tech reports from us.
Contact us: email

Water hardness falls into two categories: permanent hardness and temporary hardness. Permanent hardness does not influence water’s taste or how household appliances work. Temporary hardness affects the taste of food and beverages prepared with hot water. Further, it causes limescale deposits in home appliances that heat water, such as kettles, steam irons, coffee makers and washers.
By reducing water’s temporary hardness, our water filter cartridges reduce taste and aroma impairing substances and limescale build-up. The result is great tasting water for hot drinks and dishes prepared with water, and less lime scale build-up in home appliances. How hard is your water? Order a free water hardness test strip to find out.

The stock is sold out and we have no stock available currently. Please contact us if you want to know when will the items available

Once your order is shipped, you will receive an email from us containing the tracking information. Tracking information is also available in your "Order Details" page.

If the payment page displays an error, please kindly try to reorder. And if the same thing happens, then please contact Customer Service for help via Live Chat or email

If you wish to cancel an order, please contact our customer service team.

If you contact us within 24 hours of purchase:
We can cancel the order for you at no additional cost. The cancellation may take up to 3 days, thank you for your patience and understanding.
If the package is already shipped, we will issue a prepaid label and return your payment AFTER we have received the package from you.

If you contact us after 24 hours of purchase:
You need to bear the return fee if the package is already shipped (depends on our system, not the order status).
The product has to be damage-free, packed in the packaging we sent to you, and with the original receipt of the purchase.
We will return your payment AFTER we have received the package from you.

Distribution Program
Become our distributor to get the best price, priority to new products, and unlimited tech reports from us.
Contact us: email