HEDP 60% – Hydroxyethylidene Diphosphonic Acid | ZEELCHEM™ 101
- CAS
- 2809-21-4
- Code
- ZEELCHEM™ 101
₹170/kg₹11,050 per 65 kg carboy
Chemical structure
Representative actives: phosphonate + polycarboxylate
- Formula
- Organophosphonate / polymer blend
- Mol. weight
- Blend
- CAS
- –
RO Antiscalant – ZEELCHEM™ 9003
High-performance liquid antiscalant that prevents mineral scale on RO membranes, protecting flux and permeate quality and lowering the cost of producing clean water.
Price per pack₹8,100
₹135/kg+ 18% GST · freight to-pay
- Dispatch in 1–2 daysFrom Vadodara, all India
- GST tax invoiceFull input credit
- Secure paymentUPI, card, net banking
- TDS, MSDS, COAWith every batch
What is RO Antiscalant?
RO antiscalant is a chemical dosed into reverse osmosis feedwater at 2–5 ppm to stop carbonate, sulphate, silica and fluoride scale forming on membranes. ZEELCHEM™ 9003 is compatible with TFC polyamide membranes and sold at ₹135/kg in 50 and 60 kg carboys.
| CAS number | – |
|---|---|
| Formula | Organophosphonate / polymer blend |
| Molecular weight | Blend |
| Product code | ZEELCHEM™ 9003 |
| HSN code | 38249900 |
| Price | ₹135/kg, ₹8,100 per 60 kg carboy + GST |
| Made in | Vadodara, Gujarat, India |
About RO Antiscalant
ZEELCHEM™ 9003 is an organophosphonate / polymer blend that works by threshold inhibition, crystal modification and dispersion, all at very low (sub-stoichiometric) doses.
It covers carbonate, sulphate, fluoride, phosphate and silica scale and keeps iron and metal oxides dispersed, so they leave in the reject stream.
Key benefits
- Longer membrane life
- Higher system recovery
- Fewer CIP cycles and less downtime
- Stable flux and pressure
- Better salt rejection
- Replaces hazardous acid dosing
Scales and foulants controlled
- Calcium carbonate (CaCO₃)
- Calcium sulphate (CaSO₄)
- Barium sulphate (BaSO₄)
- Strontium sulphate (SrSO₄)
- Calcium fluoride (CaF₂)
- Calcium phosphate
- Silica (SiO₂)
- Iron and metal oxides (dispersed)
Also known as: RO antiscalant, membrane antiscalant, reverse osmosis antiscalant, RO chemical, scale inhibitor for RO
Technical specifications
| Product code | ZEELCHEM™ 9003 |
|---|---|
| Appearance | Clear to pale-yellow liquid |
| Odour | Odourless to mild |
| pH (neat) | 2.0–4.0 |
| pH (1% solution) | 2.5–4.5 |
| Specific gravity @ 25 °C | 1.15–1.25 |
| Solubility | Completely miscible with water |
| Active chemistry | Organophosphonate / polymer blend |
| Recommended dose | 2–5 mg/L (ppm) |
| Membrane compatibility | TFC polyamide membranes |
| Freezing point | approx. −5 °C |
| Shelf life | 12–24 months (sealed) |
| Packaging | 50 kg / 60 kg HDPE carboys |
Applications of RO Antiscalant
- Brackish water and seawater RO (BWRO / SWRO)
- Industrial process and cooling RO
- ZLD and high-recovery systems
- Power and boiler feed (DM water pre-treatment)
- Food & beverage process water
- Pharmaceutical and ultrapure water pre-treatment
Dosage and how to use
- Typical dose 2–5 ppm of feedwater; confirm with membrane projection software and feedwater analysis.
- Inject continuously upstream of the cartridge filter and high-pressure pump via a calibrated metering pump.
- Do not overdose. Avoid cationic coagulants/polymers and high residual iron or aluminium upstream.
- A silica-specific grade is available for high-silica feedwater.
Dosing estimator
–per day
–metering pump
–per month
Estimate only. Confirm dosage with a water analysis and trial – our team can help.
Safety, storage and handling
- Handle with standard chemical PPE; refer to the SDS before use.
- Store sealed in a cool, dry place away from sunlight; protect from freezing.
- Industrial use only. For potable RO, confirm the grade's certification first.
Industrial use only. Read the current safety data sheet before handling.
Documents
Batch COA is sent with every dispatch. Ask for any document on WhatsApp.
Frequently asked questions
What is RO antiscalant used for?
It stops sparingly soluble salts from scaling RO membranes by holding minerals in solution.
How much RO antiscalant should I dose?
Typically 2–5 mg/L, confirmed by projection and water analysis.
Is antiscalant better than acid dosing?
Generally yes: it covers sulphate and silica scales that acid cannot, and avoids strong-acid handling.
Will it damage membranes?
Not when dosed correctly on TFC polyamide membranes. Overdosing or mixing with cationic polymers can cause fouling.
Can it be used for drinking water RO?
Only grades certified for potable use (e.g. NSF/ANSI 60). Ask us for the right grade.
What is the shelf life?
12–24 months sealed, stored cool, dry, away from sunlight and above freezing.
Technical content reviewed by M.R. Patel, Technical Head. Last updated 26 October 2026.
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