Watermaker treatment that starts in the feed.
Four treatments: an antiscalant and a biocide dosed into the feed, and an acid and an alkaline cleaner for offline cleaning. Formulated and batch-tested in our own plants in Fujairah and Athens.
What are you treating?
Why it matters
Three numbers tell you it is time to clean.
Normalised permeate flow down more than 10%. Differential pressure up more than 10%. Salt rejection down more than 10%. Any one of them means something is already sitting on the membrane surface.
Scale
Calcium carbonate and sulphate salts drop out as the feed concentrates, and set on the membrane surface.
Biofouling
Bacteria and algae build a slime layer that pushes differential pressure up and permeate flow down.
Iron fouling
Iron and metal oxides from the feed or the pipework coat the membrane in a rust-coloured layer.
Organics
Oil, grease and organic matter from the process cling to the surface and cut permeate flow.
Sheran manufactures four membrane treatments at its own plants in Fujairah and Athens.
The range
Four treatments. Two in the feed, two for cleaning.
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Dosed into the feed
Dosed into the feed
Sher RO-30 Antiscalant
Stops carbonate and sulphate scale forming on the membrane, so the plant can run at higher recovery
Dose
2 to 10 ppm, continuous, set by scaling potential
Dosed into the feed
Sher RO-35 Biocide
Non-oxidising biocide for bacteria, fungi, algae and biofilm on RO, NF and UF membranes
Dose
50 to 500 ppm, set by how heavy the fouling is
Cleaning in place, offline
Cleaning in place, offline
Sher RO-28 Acid Cleaner
Dissolves iron, rust, metal oxides and light carbonate scale during an offline clean
Dose
3 to 6% solution at pH 3 to 4, circulate 4 to 24 h
Cleaning in place, offline
Sher RO-29 Alkaline Cleaner
Lifts organic fouling, biofilm, oil and grease, and keeps it suspended so it does not settle back
Dose
2 to 5% solution at pH 10.5 to 12, circulate 4 to 24 h
Looking for a safety data sheet?
Material safety data sheets are issued on request, for any product in this range.
Where it acts
Every stage of the watermaker.
From the feed line to the cleaning skid, each treatment works at a different point. Dose where the problem is.
The dosing point after pretreatment. Antiscalant and biocide go in here, continuously.
Sher RO-30 Antiscalant
Sher RO-35 Biocide
The last barrier before the high-pressure pump. Suspended solids kept dispersed.
Sher RO-30 Antiscalant
Where scale, biofilm, iron and organics settle. Watch flow, pressure and rejection.
Sher RO-30 Antiscalant
Sher RO-35 Biocide
Sher RO-28 Acid Cleaner
Sher RO-29 Alkaline Cleaner
Offline recirculation through the elements, 4 to 24 hours at 25 to 40°C.
Sher RO-28 Acid Cleaner
Sher RO-29 Alkaline Cleaner
Suitable for shipboard RO watermakers and other reverse osmosis, nanofiltration and ultrafiltration membrane systems.
Common questions
Cleaning, dosing and compatibility.
When normalised permeate flow drops more than 10%, differential pressure rises more than 10%, or salt rejection falls more than 10%. Clean straight away if you can see iron fouling, scale or biofilm.
It depends on what is on the membrane. Iron, rust and carbonate scale call for Sher RO-28, the acid cleaner. Organic fouling, biofilm, oil and grease call for Sher RO-29, the alkaline cleaner. Send us your feed analysis and we will tell you which one, and in what order.
Between 2 and 10 ppm, dosed continuously into the feed upstream of the cartridge filters. Low scaling potential sits at 2 to 3 ppm, severe conditions at 8 to 10 ppm. Your feed water analysis decides where you fall.
Sher RO-30 is compatible with thin-film composite elements, and all four treatments are made for RO, NF and UF systems. Always stay inside the membrane manufacturer's cleaning limits for pH and temperature.
With Sher RO-28, the solution turns dark red or brown once its cleaning capacity is used up. Replace it and keep circulating, then flush with clean water until the discharge pH matches the feed.
All four come in 25 kg and 200 kg drums: Sher RO-30, RO-35 and RO-29 in HDPE, Sher RO-28 in PE.
Order
Tell us the watermaker, we will tell you the programme.
Send the watermaker make and model, its daily fresh-water output and current permeate flow. We will come back with a dosing programme and a price, usually within one working day.
Two production units
Fujairah and Athens
Certified
ISO 9001:2015
Trade Net ID
ShipServ TN-315946
Partner ID
ProcureShip PS ID 14754
