Total Solids vs. Total Suspended Solids: Key Differences and Measurement Tips
Total Solids (TS) is the combined mass of everything that remains after all water is evaporated from a sample. Total Suspended Solids (TSS) is the portion caught on a filter, excluding dissolved salts.
Homebrewers panic over cloudy beer, grab a TSS kit, and forget the dissolved minerals—then wonder why their “dry” readings don’t match taste. Wastewater labs see the same slip when they chase visible grit and overlook invisible salts.
Key Differences
TS dries the entire sample; TSS isolates only what a 1.2 µm filter traps. TS tells total waste strength, TSS reveals particulate load. Different methods: TS uses an oven at 103–105 °C; TSS uses vacuum filtration plus the same oven.
Which One Should You Choose?
Need discharge limits? Test TSS. Designing evaporation ponds? Measure TS. Routine brewery QC? TSS for clarity; TS for mineral balance. Match the parameter to the decision you actually have to make.
Examples and Daily Life
A café tests TS to size its reverse-osmosis system. A koi-pond owner checks TSS after adding flocculant to clear murky water. Same lab, different filters, different outcomes—both keep customers happy.
Can I use one filter for both tests?
No. The TSS filter traps solids; TS requires the whole, unfiltered sample. Use separate aliquots.
How fast can I get results?
TSS: 30 minutes filtration + 1 hour drying. TS: 1 hour drying only. Factor in cooling and weighing time.
Does temperature matter?
Yes. Drying ovens must stay at 103–105 °C; higher drives off volatile solids and skews both readings.