Media is bulky, cheap per kilogram and hard to inspect. That combination is why quality claims are so common and so rarely resolved. These are the checks that can be done with a ruler, a scale and a bucket.
Also searched as: water treatment media quality inspection · how to check tube settler quality · verify mbbr carrier density · media acceptance testing
Take ten modules or ten carriers at random from different positions in the delivery. Measure the module envelope against the drawing (ours are 1000 × 500 × 1000 mm for settling media) and the cell against the size you ordered (Φ25 to Φ90 mm). For carriers, measure the nominal diameter and height.
This one check catches the most common substitution: the right product at a smaller sheet thickness or a larger cell, both of which keep the price looking competitive while delivering less material.
Specific surface for a honeycomb media follows from the cell geometry: count the cells across a known width, work out the hydraulic diameter of one cell, and the surface per unit volume follows. Do it on the delivered sample and compare it with the published figure for the size you ordered. Our published range is 62–236 m²/m³ across Φ25–90 mm, and the number moves with cell size, so a delivered sample that does not match the size you specified is the finding - not a claim about the supplier's table.
The same logic applies to random packing: the pieces-per-cubic-metre figure is published per nominal size, so count a known volume and compare. For a Pall ring in the published range that is roughly 143,000 pcs/m³ at 16 mm down to 1,860 pcs/m³ at 76 mm.
| Carriers | Weigh a counted number of pieces and compare with the published mass. Our K-series carries a published bulk density of 0.96; a carrier that floats differently in the basin usually weighs differently out of it |
| Void fraction | For carriers, published porosity is 85–90 %. A simple water-displacement test on a counted sample is enough to catch a material substitution |
| Sheet thickness | Micrometer on the plate: published options are 0.4, 0.5 and 0.8 mm across the cell range. This is a direct material quantity, so it is also a direct price difference |
Polypropylene, HDPE and ethylene-propylene copolymer are visually almost identical. The practical field tests are density (polyolefins float, and the copolymer grades sit differently from PP in a salt solution), behaviour in a flame, and - for anything where the difference matters contractually - a supplier material declaration. If your specification names a material, ask for the declaration in writing at order stage, because it cannot be reconstructed afterwards.
Datasheets to check against: specification sheet (PDF) · tube settler technical details · MBBR technical details · pall ring data.
Yes for honeycomb and structured media: it follows from the cell geometry, so a ruler and a count are enough to confirm the delivered cell size matches what was ordered. For random packing, count a known volume against the published pieces per cubic metre.
Visually you cannot. Use a density check in water and salt water, a flame test for a first indication, and a written material declaration from the supplier for anything contractual. The published service life difference - 3-4 years for PP against 8-10 years for copolymer - is why this matters.
The grade, the nominal size and tolerance, the count per cubic metre or module count, the material, and the acceptance check to be used on arrival. That last line is what turns a quality dispute into a measurement.
Raise it at delivery with the sample retained and photographs of the measurement. Every check above is repeatable, which is the point: hold the sample, hold the count, and the conversation has a factual basis.
Every product page publishes the figures above, and the quotation repeats them for the grade you are buying.
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