Technical Insights
Notes on media selection and filter performance
Written for the engineer specifying the bed, not the person approving the invoice. No product pitch.
- Filter media
6 min read
Uniformity coefficient: the number that decides how your filter behaves
Everyone specifies a size range. Far fewer specify the uniformity coefficient — and it governs head loss, backwash behaviour and bed life more than the range does.
Read more - Bed design
5 min read
Why multimedia beds fail: density spacing, not media quality
A tri-media bed that intermixes on the first backwash was doomed at the purchase order, not at commissioning.
Read more - Specification
4 min read
Acid solubility: the specification that fails you in year two
A bed that passes on commissioning and degrades slowly afterwards is usually dissolving. Here is how to specify against it.
Read more - Groundwater
4 min read
Sizing a well gravel pack from the formation, not a catalogue
Sand ingress and short pump life usually trace back to a pack that was ordered by size rather than calculated from the formation.
Read more - Decorative aggregates
3 min read
Resin bound surfacing: moisture is the whole story
Most resin bound failures in the first year are not resin failures. They are aggregate that arrived damp.
Read more
Got a filter that is not behaving?
Send us the sieve analysis, the run times and the backwash regime. Most problems are diagnosable from those three things, and we do not charge for the answer.