Plan a trial for your application
Chemical phosphorus removal
On the same effluent, evaluate soluble phosphorus, sludge volume and residual iron.
Industrial water conditioning
Compare feedwater pH, dissolution behavior and settling after treatment.
Purchase specifications and incoming inspection
Review these properties when selecting and inspecting incoming material. Example figures refer to the cited grade or source. Confirm the offered specification, packaging and lead time in the quotation. U.S. EPA · Nutrient control design manual: phosphorus removal with iron salts ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| Ferrous iron | % by mass | Confirm against the offered grade and purchase specification | Express as Fe²⁺. Total iron does not establish ferrous iron content. |
| Hydration state | Chemical formula | Confirm against the offered grade and purchase specification | Identify the actual commercial form, such as monohydrate or heptahydrate. |
| Insoluble matter | % by mass | Confirm against the offered grade and purchase specification | Specify dissolution and filtration methods. Apply the residue tolerance of the equipment. |
When approving a sample, record the grade, methods, limits and specification revision. On receipt, match the packing lot number to the lot-specific COA and record the measured values and release decision.
From samples to commercial delivery
Packaging and receiving
Mark hydrate and net weight on each bag. Check seals, colour differences and moisture exposure on receipt.
Storage and handling
Record sampling times at factory release and bag opening. Retest ferrous iron and impurities.
Sample and order lead times
State treatment scale, trial quantity and acceptable packaging. Request minimum quantities, preparation times and arrival dates for lab samples, pilot lots and routine replenishment.
Questions from the plant
Does surface discolouration mean the entire batch has failed?
Take representative samples from different locations. Measure ferrous iron and total iron separately.
Can a ferric salt replacement dose be based directly on effective iron?
Check how ferrous iron oxidises in this process. Trial actual influent and compare residual iron.
Report a delivery or batch issue
Include the order number, lot number from the package, label photos and inspection records for the affected lot. When retesting, check Ferrous iron, Hydration state, Insoluble matter.
Request documents for your application
TDS · Technical data sheet
For grade selection and sample approval, specify the grade and revision required.
SDS · Safety data sheet
Specify the country or region of use and the required language.
COA · Certificate of analysis
Request a sample COA during supplier review. For incoming inspection, provide the actual lot number.