Home › Wastewater systems
A property owner asks, before buying a small wastewater treatment plant, whether the price is shown, what servicing costs, whether the device has been tested to the standard and how long the warranty is. These decide 50 points out of 100.
Score shows how the company does on our comparison criteria, on a 0–100 scale. Rankings cannot be bought.
Basic metrics · 64.5
+ All small wastewater treatment plants tested to the EN 12566-3 standard and CE marked, which is clearly stated
Basic metrics: 64.5, rank 1 · no change
Basic metrics · 58.8
+ The total price of a small wastewater treatment plant is public (Clewer 800S 7,478 euros including VAT of 25.5%) and the online shop lists component prices in euros
Basic metrics: 58.8, rank 4 · ▲ 2 places
– Service price or terms: The price of a service visit or a service agreement was not found on the pienpuhdistamot page, in the online store or on the returns and warranty page. The online store sells spare parts and chemicals.
Basic metrics · 53.9
+ BioKem batch treatment plants are EN 12566-3 certified and CE marked, and the website presents the BAT-level (best available technique) purification result
Basic metrics: 53.9, rank 5 · ▲ 2 places
– Service price or terms: The price of a service visit was not found on the BioKem product page, Raida's BioKem page or the BioKem FAQ. The pages only say that the service interval is long.
Basic metrics · 40.8
+ The Labko range covers settling and holding tanks, the BioVision system and the BioKem batch treatment plant from the same manufacturer
Basic metrics: 40.8, rank 6 · ▲ 2 places
Basic metrics · 62.0
+ Wide domestic selection: Kemik batch treatment plant, settling and holding tanks, and soil filtration packages all from the same manufacturer
Basic metrics: 62.0, rank 2 · ▼ 3 places
– Maintenance service price or terms: The price or terms of the maintenance service were not found on the Kemik product page, on the wastewater systems page or in the sales and delivery terms. The product page only says that the tank is emptied by a suction truck 1–2 times a year.
Basic metrics · 60.4
+ Prices are publicly visible in the company's own online shop without logging in (Trio small treatment plant 7,750.00 euros, Light greywater filter 499.00 euros)
Basic metrics: 60.4, rank 3 · ▼ 3 places
– Price or terms of the maintenance service: The price of the maintenance service was not found on the Greywater filter 125 page, the warranty page or the delivery terms. The page only has a maintenance instruction: the filter material is replaced about every 100 days of use.
Weights are fixed. All companies are measured on the same scale. Read the full methodology.
| Buying motive | What is measured | Scale | Weight |
|---|---|---|---|
| Price is shown before purchase QUESTIONCan I see the price of a small wastewater treatment plant on the manufacturer's site before I make contact? | Whether the price of a wastewater treatment plant is published on the manufacturer's own product or online shop page. | Price published = 100 points, price only on request or from a reseller = 0. | 20 p |
| Price or terms of the maintenance service QUESTIONDo I know in advance what servicing the treatment plant costs? | Whether the price of a service visit is published (100) or whether a service inspection is said to be free but the follow-up price is missing (50). | Servicing visit price list public = 100, free service inspection with no follow-up charge = 50, not stated = 0. | 12 p |
| Testing and CE marking QUESTIONHas the treatment plant been tested to an official standard? | Whether the manufacturer mentions both the CE marking and the EN 12566-3 standard. | CE and EN 12566-3 mentioned = 100, CE marking only = 50, not stated = 0. | 8 p |
| Device warranty QUESTIONHow long is the warranty on the treatment plant? | The treatment plant's equipment warranty in years for the consumer. A separately mentioned tank warranty is stated in the additional information. | 3 years or more = 100 points, 0 years = 0, in between directly proportional. | 10 p |
| Basic metrics | Digital quality, transparency, reachability and AI quality score | Basic metrics × 0.5 | 50 p |
We scored 6 Finnish wastewater system manufacturers on 23 metrics. The key question for the buyer: are the system's price, sizing to household size, warranty and certification visible already on the site, or do they only come out through a request for quotation or from a reseller?
For a property in a sparsely populated area, a wastewater system is a statutory requirement and often an investment of thousands of euros. We compared six Finnish manufacturers with one question: how much can a buyer find out from the website alone before a quote request. What is decisive is whether the system's price, sizing to the household, warranty and certification are shown openly or only after contact.
System price, price example or public online shop price shown (not only a quote request or login) (24), sizing by household size (persons or litres/day) stated (14), warranty or warranty terms stated on the site (12), EN 12566-3, CE marking, type approval or treatment results shown (10), system range stated (package treatment plant, septic/holding tank, soil filtration system, greywater) (10), maintenance, service interval or service contract stated (8), resellers, installation or delivered-installed option stated (6), delivery or online shop delivery terms stated (6), business ID (Y-tunnus) or operating company shown (6), contact details shown (4)
Transparency is 30% of the basic metrics, i.e. 15% of the total points · these metrics make up its 100 points · the full formula and the other pillars
How to read the comparison correctly: Half of the points come from buyer's questions, i.e. things the buyer finds out before deciding. The other half measures how openly the company publishes its prices, terms and contact details. Clear differences in points indicate a genuine difference: one tells you the price immediately, another only after logging in. Close scores should not be read as a ranking order, because every measurement has a margin of variation. The measurement accuracy and the full calculation formula are open in the methodology.
Customer experience is brought into the assessment separately. We also collect customer feedback and customer experiences about companies through separate surveys. The survey results will be added to the overall assessment later.
For a property in a sparsely populated area, a wastewater system is a mandatory investment, and correct sizing for the household matters more than price alone.
Some manufacturers sell systems in their own online shop at public prices, while others give the price only on a quote request or through a reseller.
A batch treatment plant, a septic tank and a soil filtration system suit different sites, so transparency about range, certification and maintenance is essential for the buyer.
Every company is measured with the same public formula: half of the points come from buyer's questions and half from basic metrics, which have four pillars: technical quality, transparency, reachability and AI quality score. Ranking cannot be bought, and you can see the origin of each point on the company's profile. Read the full methodology →
For year-round living the most common solution is a batch treatment plant that treats all wastewater. If the soil and plot allow, a combination of a septic tank and a soil filtration bed can be an option. The choice is affected by household size, plot soil and proximity of groundwater.
Some sell systems in their own online shop at public prices, others through resellers and HVAC wholesalers, in which case the price is formed in a quote including installation. In the comparison, a public price is regarded as more transparent from the buyer's point of view.
It is a European standard under which the treatment efficiency of a small wastewater treatment plant has been tested and the product is CE marked. The marking shows that the device's ability to treat wastewater has been measured impartially.
The service interval depends on the type. The tank of a batch treatment plant is typically emptied a couple of times a year and chemicals are added as needed, while some bioreactor models state longer emptying intervals. Check the maintenance needs in the manufacturer's instructions before buying.
The free pre-analysis shows every item where your company loses points and which rank fixing it is enough for. The paid analysis shows what the items are and how to fix them.
Can't find your company on the list even though it should be there? Get in touch and we will include it in the next measurement round.
See the free pre-analysis A ranking cannot be bought. The analysis shows how it is earned.