What antiscalant should I use for an RO system?

It depends on the scaling risk in your feed water. Phosphonates (HEDP, PBTC) suit carbonate/sulphate scale; polyacrylates disperse particulates; blends give broad-spectrum control including silica.

What is the difference between HEDP and PBTC antiscalant?

Both are phosphonates. PBTC offers better chlorine tolerance and calcium compatibility at higher doses; HEDP is a cost-effective threshold inhibitor. Selection depends on feed chemistry.

Where to buy RO antiscalants in Vietnam?

HexaChem supplies phosphonates, polyacrylates and blended antiscalants for RO and cooling water in Vietnam. Send your water analysis for a recommendation and quote.

Choosing an antiscalant for RO systems

In reverse-osmosis (RO) systems, dissolved salts concentrate on the membrane surface and can precipitate as scale — most commonly calcium carbonate, calcium sulphate, barium/strontium sulphate, calcium fluoride and silica. Scale cuts flux, raises pressure and shortens membrane life. Antiscalants prevent it at low dose.

Main antiscalant chemistries

Phosphonates (HEDP, PBTC, ATMP) — excellent threshold inhibition and crystal distortion for carbonate and sulphate scales.
Polyacrylates / polycarboxylates (PAA) — strong dispersants, effective on particulates and some sulphates.
Blends — most commercial RO antiscalants combine chemistries for broad-spectrum control, including silica.

HexaChem supplies water-treatment actives including phosphonates and polyacrylates for RO and cooling systems.

How to choose

Identify the limiting scale from your feed-water analysis and recovery (LSI/S&DSI, sulphate and silica saturation).
High LSI / carbonate → phosphonate-based.
High silica → specific silica-dispersant blends.
Match dose to concentration factor; overdosing phosphonates can itself form calcium-phosphonate scale.

Send HexaChem your feed-water analysis and our technical team will recommend the right antiscalant and dose for your RO system in Vietnam.