Shopping for a dispenser, filter or commercial supply solution, you keep meeting the names NSF,SGS,WQA — but the three are different in kind. Judged on the name alone, testing, certification and trade association blur into one. This article organises the common water certification and testing concepts as plainly as possible, so product comparisons come into focus.
Why read up on certification and testing before buying?
For an ordinary buyer, certification and test data do not mean a name alone makes a product better. They help you see: whether the product has the corresponding documents, what those documents cover, and whether the supplier can clearly account for the testing or certification basis. Comparing home, office or commercial options, this information all counts.
What does NSF/ANSI 42 mainly stand for?
NSF/ANSI 42 appears often around drinking water systems, mainly concerning sensory aspects — smell, taste, residual chlorine and the like. It does not cover every water-quality issue at once; it provides a standardised reference for a specific scope. So when reading, check which standard the model actually corresponds to, rather than stopping at the words 'has NSF'.
And NSF/ANSI 58?
NSF/ANSI 58 generally relates to RO reverse osmosis systems and applies to a more specific system type. When a product page cites NSF/ANSI 58, the point is whether that model is such a system and whether the document corresponds to that standard. Different models and structures do not all fall under the same standard.
Are SGS testing and NSF certification the same?
They are not. Broadly, NSF/ANSI belongs to the world of standards and corresponding certification; SGS commonly appears on third-party testing or test documents. Both can serve as reference, but neither substitutes for the other. Read for the document's nature, its scope, and whether it is a test report, test results, or certification against a standard.
And what is WQA?
WQA is the Water Quality Association, part of the water industry's trade association landscape. When material mentions WQA, first identify its role on that page — industry background, educational information, or some extension relating to standards. The point is not to read WQA as a product certification held by any particular Bio-Link product.
How should you read this material when buying?
- Check the model correspondence first: whether the material states clearly which model corresponds to which document or standard.
- Then the document's nature: a test report, third-party testing, or certification against a standard.
- Never stop at a single term: read it alongside the product type, supply method, installation setting and the maintenance that follows.
- Watch whether the supplier can account for it clearly: being able to explain the documents' scope, currency and model correspondence usually matters more than the term itself.
The picture across Bio-Link today
Among Bio-Link's current common models, ST1523,ST9102 and ST2011 serve as reference models for the NSF/ANSI 42 and 58 concepts. Also watch whether the product or system carries third-party test data. In practice, always read against the corresponding model, the document's content and the product page.
Frequently asked questions
What is the difference between NSF/ANSI 42 and 58?
They correspond to different things. Broadly, NSF/ANSI 42 concerns sensory aspects, while NSF/ANSI 58 relates to RO reverse osmosis systems. When reading, check that both the model and the system type correspond to the standard.
Is SGS testing the same as NSF certification?
No. SGS commonly appears on third-party testing or test documents; NSF/ANSI belongs to standards and certification. Both are useful references, but neither substitutes for the other.
Does WQA mean a product holds a particular certification?
It should not be read that way. WQA is part of the trade association landscape; the real judgement comes back to the product model, the documents and what the page actually lists — and WQA's actual role there.
Should I look at the certification name first, or the product model?
Generally start with the product model and the setting, then check that model's certification or test data. That reads far truer than a certification name alone.