Choosing a water filter

Choosing a water filter

Water quality, equipment and measurements
 See General brochure - water quality, equipment and measurements (PDF:1,800 kt)

Good-quality household and drinking water is one of the most important requirements for a good quality of life.  All water has to be nice and fresh. Oy WatMan Ab Vedenkäsittely focuses on supplying equipment to improve the quality of water. A household water filter may be your second most important acquisition. In dispersed settlement areas, the most important acquisition is the water pump, supplied by our parent company Pumppulohja Corporation. We both operate under the same roof in Saukkola, near Lohja in Finland. We are able to meet even demanding requirements for a reliable equipment supplier. We will help you choose the right WatMan filter for your household. All our products come with an extensive guarantee.

Water quality To determine the right filter type, we must know the origin and quality of the filtered water. This can be done by commissioning a household water analysis from a water laboratory or with our water analysis and test filtration.

Operating principles of our equipment

The operation of our Fe series filters is based on natural filtration, in which the water is oxidised with water pressure from a pressure tank. The Fe filtration series preserves the freshness of water and even improves it, as oxygen is used in the filtration process instead of chemicals. Filtered water retains its coolness as the water capacity is small, and the filtration does not have to be enhanced with a water heating pump.

The operation of the IX series is based on ion exchange, and it enables the removal of lime, iron, manganese, humus and uranium. The hardness of the water is determined by the calcium and magnesium sulfates dissolved in the water. Problems caused by hard water can be prevented permanently by installing a water softener filter IX to the waterline. Humus-induced nuisances can be prevented by installing a humus and iron filter IX HK to the waterline. The filtered water becomes soft and it no longer clogs the water equipment. In addition to hardness, the equipment can be used to remove dissolved iron and manganese. The same equipment also enables uranium removal.

With the MLF series machinery, several types of impurities can be removed. The filler substances of the filter are chosen based on the kinds of impurities to be removed.

The RO series machinery removes salt, chloride, arsenic, fluoride, uranium and nitrates, to name a few. In the Finnish conditions, salt is found abundantly in coastal areas, in particular. Excess salt is harmful to health and it rusts water equipment as well as shortens their working life. Nitrate is found especially in agricultural areas and wells next to fields; the largest source of nitrates is, in fact, agriculture and fertilizers. The negative effects of both nitrate and fluoride are greatest to children, but adults should also avoid these compounds.


Osmosis is a natural phenomenon. If two liquid solutions, one salty and one saltless, are separated from each other with a semipermeable membrane, the saltless solution strives to dilute the salty solution until the salt content is even on both sides of the membrane. A pressure difference, i.e. osmotic pressure, is formed between the solutions. For water cleaning purposes, this phenomenon should be reversed. The rejection takes away over 90% of the impurities in raw water. The equipment is installed either in the technical facility of the household or a sink cabinet. The capacity of smaller machinery is around ten litres a day, which is sufficient for covering all cooking and drinking water. The smallest of the machines is equipped with its own tap. The largest ones are typically equipped with a clean water storage tank and a separate pressure accumulator.


The RnAI series aeration equipment is suitable for the removal of radon, hydrogen sulfide and carbon dioxide. Overall, radon (including that occurring in indoor air) causes approximately 200 cases of lung cancer annually. Being a gaseous substance, radon can be easily removed through effective aeration. Air that contains radon is directed outdoors in a controlled manner with a fan. A radon aerator is installed right after the bore well pump. According to unbiased studies, over 99% of radon can be removed. Because the machinery removes radon and its degraded products from the water system, it does not form a secondary radiation source itself. Uranium can be removed with a WatMan IXHK series filter.

The RnH and RnAH series machines make another suitable option for radon removal. The RnAH model is equipped with counter-current washing automation. The activated carbon is especially well suited for removing small or medium-sized (< 5,000 Bq/l) radon deposits. In the automated models, the RnAH mass can be rinsed to remove sedimented impurities, such as rust. The machines of the C series, the FeAC series and some of the MLF machinery are suitable for water alkalisation, i.e. raising the pH levels of water. In the worst case scenario, the corrosion of copper and other metal tubes leads to significant water-induced damages. It is recommended that the cause is determined with a chemical analysis and immediate action is taken. The machinery of the C series leads the water through alkalised limestone-like mass. Aggressive free carbonic acid is neutralised, the pH and hardness levels of water rise and the corrosion stops. The investment itself is small; at its lowest, a few hundred euros. Considering the entire lifetime, this may mean as little as 10–15 euros per year. The machine is installed before the pressure tank. 

Machine size and installation

Water consumption in a detached house is typically less than 20 l/min. The smallest WatMan filters are adequate for cleaning the water of one or even two households. WatMan filters can be installed in any space as long as the space does not freeze and it features a sewer. The RnH series activated carbon filters must not be assembled closer than 3–5 meters away from living space.

Choose the correct filter size

We will help you choose the correct filter size. We always grant extensive guarantees to our products. Therefore, we hope to make the machinery choice together with you.

Tank materials

Our filtration machinery tanks come in several different materials. The Fe series machinery is available with either plastic or stainless tanks. the IX series machinery is supplied with plastic tanks. The material of the RnAI aeration machines is food contact approved PE plastic.

User friendliness

The model of the hand-operated WatMan filters is FeM. For sites in which water use is continuous, we usually recommend automatic FeA or IX series machineries. Their easy of operation has been maximised and their normal maintenance takes about 30 minutes twice a year. Automated machines are a superior choice when it comes to user friendliness.


Fe series filters do not require any chemicals, but the mass part wears in use and has to be replaced every now and then. These chemical-free machines have gained great popularity due to their easy care. The IX series ion exchange-based filters can be revived automatically with table salt (NaCI). We recommend IX series machines when water rich in humus needs to be filtered into high-quality domestic water.

Filter expenses

We have managed to keep the acquisition price of WatMan filters affordable despite its high-quality properties. For each and every use, there is a suitable filter available at the right price.


WatMan grants a quality guarantee for filtered water according to Decisions 401/2001 and 461/2001 by the Ministry of Social Affairs and Health. An additional 1–3-year mechanical guarantee is also granted and the right to refund naturally applies as stipulated in the consumer protection law.


Basic machines are delivered straight from our warehouse to your door or to an HPAC store of your choice. Filters are shipped anywhere in Finland within a few days. Our deliveries always include clear instructions.


We are an affiliate company of Pumplohja Corporation. For decades, Pumplohja has been one of the main pressure tank and household pump manufacturers in Northern Europe. We have supplied nearly 10,000 filter machines for households, schools, farms, municipalities, cities and industry. According to an unbiased satisfaction survey, clearly over 90% of our customers were either satisfied or highly satisfied with our services and products. (Häme University of Applied Sciences, TkL Lehtonen, 1998) We have skilled employees, our own laboratory and wet test facilities. In case of any problems, we never leave our customers alone. We always do our best to resolve any problems. Our own laboratory and test facilities  are a major advantage in these issues.


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Terms and conditions

Ordering and delivery terms in our online store


The vendor, and future supplier, will be Oy Pumppulohja Ab or Oy WatMan Ab Vedenkäsittely. Address Yrittäjäntie 4, 09430 Saukkola. Phone 020 741 7220 and email

Pumppulohja WatMan is a reliable and robust partner. This is evidenced by the highest possible credit rating by D & N.


Prices are quoted for each product. Prices include the current VAT. The transportation is priced separately before payment is made. All online prices only apply to orders placed through our web site.

Liability for price errors: We reserve the right to alter prices or to change any erroneous prices. If the price of the product has risen after the order has been sent, we will sell the ordered items at the price at the time of ordering. However, we reserve the right to reject an order if there is an error that is independent of the supplier. We will then automatically refund your payment.

Delivery Method:

Products are delivered by mail or by a transport company selected by the customer. Products are also available at no additional cost at our factory as per a separately agreed schedule.

Delivery time: Delivery time of the products is either product-specific, either immediately in stock or 3-7 days, with a real delivery time of 3 to 10 day from the order date. We will communicate any the longer delivery times for specialty products.

The express delivery method, when delivery takes place within the day of the order or the next business day, can be selected separately.

Payment method:

When ordering as a private person the prices take into account the online store discount, which requires payment of products with an online payment using the banking service as it appears on the front page of the online store. Prices include VAT. We distribute the products to retailers according to the terms agreed upon.

Payment Service Provider

Paytrail Plc (2122839-7) is co-operating with Finnish banks and credit institutions as a provider of payment transfer services and as a payment service provider. Paytrail Plc will be credited to the payer by bank statement or card payment and it will forward payment to the merchant. Paytrail Plc has a payment institution license. In the case of complaints, we ask you to contact the vendor first.

Paytrail Oyj
Business ID: 2122839-7
Innova 2
Lutakonaukio 7
40100 Jyväskylä
Tel: 0207 181830

Online Banking

The payment transfer service associated with e-payment is implemented by Paytrail Oyj (2122839-7) in co-operation with Finnish banks and credit institutions. For the user, the service works just like a traditional online payment.

Shipping Fee:

Before confirming the order, delivery costs are itemized on a product-specific basis. The share of shipping costs for postal products ranges from EUR 5 and for freight transport from EUR 20. In the e-commerce order, the buyer is entitled to a discount on the online store even if he or she retrieves the products from the factory.

For express delivery, we will charge a separate express delivery fee of EUR 10 when the order value is less than EUR 200 or EUR 25 when the value of the order exceeds EUR 200. Express delivery fees are charged at 1« times rate.

Binding order:

A binding trade agreement will enter into force once a customer has submitted or paid for an order. We will confirm orders over 1000 euro separately by e-mail or telephone. We reserve the right to limit the sale of products in larger batches or specialty products, for example due to poor availability. The supplier's liability for poor availability of the product, authority or import restrictions is always limited to the cancellation of the order and the refund of any possible money that has been previously paid.

The consumer has the right to cancel the order at any point, even when the order has already been processed. See the restrictions below.

Suppliers reserve the right to cancel an order if the customer has not fulfilled his obligation to disclose information, see below. In this case, the supplier's liability is limited to cancelling the sale and possibly reimbursing the money paid in advance.

Obligations of the Customer:

Before ordering, the customer must consult the product's product descriptions on our website, the product itself at our factory or by discussing the order with our sales staff. In the case of a clear product defect, suppliers may rely on it being a mistake if there was such an obvious mistake that the customer should have understood the existence of the error. Suppliers reserve the right to cancel an order if the customer has not fulfilled his / her disclosure obligations.

In this case, the supplier's liability is limited to cancelling the sale and possibly reimbursing the money paid in advance.

We continuously develop our products. For this reason, the illustrated images may be indicative and may have deviations may occur in, for example, colour. Possible deviations of the image have no effect on the technical characteristics or operation of the product.

Reminders and Returns:

The consumer has the right to cancel the order even when the order has already been processed.

If the customer cancels the order only after the delivery of the products without unjustified reason - such as a product defect -, it is a case of unilateral cancellation of the order. In the case of unilateral cancellation, we will refund the amount of money already paid for the products. However, we will not reimburse the shipping costs already paid for and they remain the responsibility of the customer.

Reminders must be made within 7 days of receipt of the goods. According to the Consumer Protection Act, the right to cancel a subscription by mail order is 7 days after receiving the first item. The consumer must return the goods within 14 days of delivery, but not in the form of cash on delivery.

Returns due to wrong product information or due to product failure are free of charge by post. If the product is returned as a carrier service, the supplier's contract number must always be indicated. The purchase date is considered the day when the shipment has been received or picked up from the post.

The right to return to online store sales applies to unused and merchantable products. During retrieval, the consumer has the right to assess the product and try it in the same way as he could do when buying a product from the store. The consumer can open the box to examine and try out the goods without losing their right of return. However, he cannot install the product for use. After the product has been used, the product is not freely refundable, but the product is subject to our general warranty terms, below.

In exceptional cases, we can accept the return of a product that is not possible to resell, defective or outside the return period. However, we charge at least 30% of the price of the returned product.


All products have at least six months' warranty under the Consumer Protection Act. On a product-specific basis, our guarantee is typically 12 to 24 months. Under the Consumer Protection Act, a buyer must notify the guarantor of the error within a reasonable time when the buyer has detected a defect.

We always comply with Finnish law. We also comply with generally accepted contract and warranty terms in Finland, such as the general Nordic Delivery Terms NL 92 of the Finnish Metal Industries Federation. The full product warranty can be obtained from or on request.

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