Known Matter guides

Technical subjects, clearly explained.

Practical, evidence-led guides for the products and testing services we provide.

Water quality · AquaTrace

Household water and microplastics

Understand microplastics in drinking water, compare common water sources, assess household filtration and learn how AquaTrace screening works.

Reef aquarium care

Understand useful calcium ranges, testing and what matters more than chasing a single number.

Work from a test result, calculate actual water volume and make measured corrections.

See how the three measurements relate and why calcium should not be adjusted in isolation.

Compare powder, prepared solution, convenience and delivered value—not just shelf price.

Tool

Estimate a prepared-solution dose and see the approximate delivered cost per dose.