12 min read · 2026-03-10
By Rajesh Chauhan, Proprietor, Drashti Chemicals
Supplying industrial chemicals from Vadodara since 2015 — ETP coagulants, RO programs, and process chemicals with batch COA/MSDS.
Expert supply · Est. 2015
Mr Rajesh Chauhan
Founder-led industrial chemical supply from Vadodara — ETP coagulant selection, RO programs, textile and pharma utility chemicals. Batch COA/MSDS on every dispatch. GSTIN 24AGLPC6288M1ZX.
Plant engineers searching for pac powder jar test calculation etp need a practical protocol — not a product brochure. This guide walks through jar testing PAC 28–30% with polyelectrolyte for textile and chemical effluent, so you lock dose before committing to bulk orders from Vadodara stock.
Drashti Chemicals supports on-site and lab jar tests for Gujarat ETP operators, then supplies batch-COA PAC, alum, ferric chloride and matching flocculants for 24–48 hour GIDC dispatch.
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Jar-test equipment and sample prep
Use a 4–6 place jar tester with 1 L beakers. Collect a representative ETP inlet sample after equalisation. Record pH, temperature, turbidity/NTU, colour (Pt-Co if available) and approximate COD. Adjust sample pH to your plant’s coagulation set-point before dosing if your process corrects pH upstream.
Prepare a 1% PAC stock (10 g PAC powder / L) for accurate microlitre-to-mg/L conversion. For liquid PAC, calculate stock from Al2O3 assay on the COA. Prepare a dilute polyelectrolyte stock (0.1%) only after fully hydrating the polymer per TDS.
Dose ladder and calculation
Run a PAC dose ladder (e.g. 20, 40, 60, 80, 100 mg/L as product) with rapid mix 1–2 min, slow mix 10–15 min, settle 15–20 min. Select the lowest dose that meets turbidity/colour targets without sticky sludge. Then fix PAC and ladder polyelectrolyte (0.2–2 mg/L typical) for floc strength and settling rate.
Convert jar dose to plant dose: Plant PAC kg/day ≈ (mg/L dose × m3/day flow) / 1000. Example: 60 mg/L PAC on 500 m3/day ≈ 30 kg/day product. Always confirm against your COA assay — PAC 30% Al2O3 grades are not interchangeable with lower alumina liquids on a kg-for-kg basis.
Textile ETP specifics
Reactive dye streams often need higher coagulant or a ferric assist for colour. Caustic and peroxide carryover from dyeing raises alkalinity and changes PAC demand — re-jar when process recipes change. Consolidate PAC + polyelectrolyte + caustic on one Drashti quote cart truck for Makarpura, Savli and Halol plants.
| Jar PAC dose (mg/L) | Flow (m³/day) | Approx. PAC kg/day |
|---|---|---|
| 40 | 500 | 20 |
| 60 | 500 | 30 |
| 80 | 500 | 40 |
| 60 | 1000 | 60 |
Boiler Water Chemicals Available from Drashti Chemicals
- Poly Aluminium Chloride (PAC) — Primary coagulant
- Polyelectrolyte — Flocculant
Frequently Asked Questions
What PAC grade should I jar-test first?
Start with PAC powder 28–30% Al2O3 for most textile ETPs. Compare liquid PAC if your plant prefers tanker dosing — always use the batch COA assay in calculations.
Can Drashti help run jar tests?
Yes. Share effluent characteristics or request technical support with your WhatsApp quote — we supply PAC and polyelectrolyte from Vadsar with COA.
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Our team can help with product selection, dosing and application guidance.
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