A dairy in Riyadh's industrial cities, a date-paste plant in Al-Qassim and a juice line in Jeddah can all run on "municipal water" and still see completely different scale problems. In Saudi Arabia the tap is only one of several possible feeds. Network water can be a mix of desalinated seawater and treated groundwater, tankers fill the gaps during peak demand, and many factories still draw on their own wells. Hardness control on a Saudi line therefore starts with the supply, not the softener.
This guide is written for plant engineers, maintenance leads and quality managers in the Kingdom's food and beverage sector. It sets out a source-by-source plan for keeping calcium and magnesium scale out of boilers, pasteurisers, CIP circuits and cooling towers.
TL;DR
- List every feed that can reach the plant (network, tanker, well) and analyse each one separately.
- Size treatment for the hardest credible feed. A plant sized for the average scales the first week the source changes.
- Softening deals with hardness only. Where well or blended water is high in total dissolved solids, reverse osmosis is usually needed for product and critical rinse water.
- Summer heat speeds up scaling in cooling towers and hot storage, so plan inspection and bleed control around June to September.
- Log the source in use alongside every hardness result, so a spike can be traced.
In this article
- Why "municipal water" is not one water in the Kingdom
- The four feeds and what to test in each
- Where scale hits first on a Saudi line
- Matching treatment to the feed
- Product water, SFDA and your food safety plan
- Brine, reject and the plant room
- A logging routine that survives a source change
- Frequently asked questions
Why "municipal water" is not one water in the Kingdom
Hardness is the dissolved calcium and magnesium in water, usually quoted as mg/l of calcium carbonate (CaCO3). When that water is heated, evaporated or concentrated, calcium carbonate drops out as scale on the hottest surfaces.
Saudi Arabia produces much of its drinking water by desalination, through the Saudi Water Authority (formerly the Saline Water Conversion Corporation) and private plants procured by the Saudi Water Partnership Company, and the National Water Company distributes it in the main cities.[1][2] Desalinated water leaves the plant very low in minerals and is conditioned before it goes into the network. In several regions it is also blended with treated groundwater, and groundwater in parts of the Kingdom is naturally hard and high in dissolved solids.[3]
For a factory this has two practical consequences:
- The feed can change without warning. A different blend, a tanker delivery or a switch to a well can shift hardness overnight.
- Published figures describe the network, not your tank. Water that has sat in a hot ground tank or passed through old pipework is what your equipment actually sees.
The four feeds and what to test in each
| Feed | Why it varies | What to analyse | How often |
|---|---|---|---|
| Network connection (NWC or regional operator) | Blend of desalinated and groundwater, seasonal demand | Total hardness, alkalinity, pH, TDS or conductivity, chloride | Quarterly, and after any supply notice |
| Tanker deliveries | Source differs by supplier and by load | Hardness and TDS on each new supplier, spot checks after that | Per supplier, then monthly |
| Private or shared well | Aquifer chemistry, drawdown in summer | Full analysis including silica, iron, manganese, sulphate | Twice a year at minimum |
| Industrial city utility supply | Operator's own treatment and storage | Same as network, plus any operator data sheet | Quarterly |
Silica matters if you run reverse osmosis or high-pressure steam, because it limits RO recovery and forms hard-to-remove deposits. Iron and manganese stain equipment and foul softener resin, so they need dealing with before softening.
Design around the worst credible result, not the best one. If a well supplies the plant for two months each summer, the softener and any RO must cope with that water.
Where scale hits first on a Saudi line
Scale forms fastest where water is hottest or most concentrated. In a Saudi plant, the usual first casualties are:
- Evaporative cooling towers and condensers. Long, very hot summers in the central and eastern regions drive high evaporation, and every litre that evaporates leaves its minerals behind.
- Steam boilers and retorts. Scale on the fire side of the tubes insulates the heat-transfer surface and raises fuel use.
- UHT, pasteuriser and juice heat exchangers. Deposits increase pressure drop and make temperature control erratic, which matters for validated heat treatments.
- Evaporators and cookers in date, syrup and confectionery processing, where water is boiled off.
- Crate, bottle and tray washers, where hot recirculated rinse water blocks nozzles and spots packaging.
Ingredient water is a separate question. Here the concern is less scale and more consistent taste, texture and mineral content from batch to batch.
Matching treatment to the feed
Choose the treatment by what is in the water and what the water has to do.
Hard but otherwise acceptable feed, used for heating or washing. Ion-exchange softening is the straightforward answer. It swaps calcium and magnesium for sodium and is easy to check with a hardness titration at the outlet. Size it on the hardest feed you have measured and on peak flow, not daily average. For plants that run through the night, a duplex unit keeps one vessel in service while the other regenerates. The Regal Twin 3672 is one option to assess against your figures.
Smaller branches, such as a single tray washer or a steam oven bank with a quiet period each night, may only need a single-vessel unit like the Commercial Softener RF1465SO1.
High-TDS well or blended feed, used in product or final rinse. Softening does not reduce total dissolved solids, and it adds sodium. Where the feed is salty as well as hard, reverse osmosis is the usual route for product water, with softening or antiscalant ahead of it to protect the membranes. Ask any supplier for recovery rate and reject volume in writing, because in a water-scarce market every litre sent to drain has a cost. The Industrial RO and Multi-Media Filtration system is built to a site analysis and required throughput.
RO permeate that needs a mineral profile. Drinks and some bakery products need a defined mineral content rather than near-pure water. Permeate can be remineralised or partly blended back to a set target, controlled by conductivity. Dosing also covers antiscalant for membranes and cooling circuits. The Sceptre DS130 dosing system handles antiscalant, pH correction and remineralisation duties.
Magnetic or electronic "conditioners". These do not remove hardness. If one is offered, ask for independent test evidence under conditions like yours before relying on it.
Product water, SFDA and your food safety plan
The Saudi Food and Drug Authority (SFDA) regulates food establishments and publishes the technical regulations that cover packaged drinking water and food production.[4] Water that goes into product, or touches product-contact surfaces, must be potable, and any treatment on it belongs in your HACCP plan with defined limits, monitoring and corrective action.
Two points catch plants out:
- Softened water is not automatically suitable as an ingredient. It carries extra sodium and the same dissolved solids as the feed.
- A change of source is a change to the process. If a well or tanker can feed the product line, the plan must say how that water is verified before use.
Brine, reject and the plant room
Before ordering equipment, check the site can support it:
- Drainage for softener brine and RO reject, and the discharge conditions set by your industrial city operator or municipality.
- Shade and ventilation for the plant room. Heat shortens the life of controllers, dosing chemicals and resin.
- Treated-water storage that does not sit in direct sun, so softened or RO water is not warmed and left standing.
- Salt and chemical deliveries with safe access and dry storage.
- Bypass control, so a hard-water bypass cannot be opened without authority and an alarm.
A logging routine that survives a source change
A good log answers one question quickly: when scale appeared, what water was the line running on?
- Record outlet hardness on each treated stream at a fixed frequency, for example every shift on boiler feed and CIP make-up.
- Record which feed was in use (network, tanker supplier, well) against every result.
- Fit online monitoring where failure is costly, such as a hardness analyser on CIP make-up or conductivity on RO permeate, with alarms.
- Trend salt use, regeneration frequency, RO recovery and heat-exchanger pressure drop. A change in any of them often shows a source change before a lab result does.
- Write down who acts on an out-of-limit result and what product is held.
A TDS meter is not a hardness test. It cannot confirm that a softener is working.
Resin, valves, membranes and dosing pumps all need planned attention. Sovereign Water's maintenance service can take this on once the treatment train is agreed. For a wider look at local supply, see our guide to hard water in Saudi Arabia.
Frequently asked questions
Our water is desalinated. Why are we still getting scale?
Network water can be blended with groundwater, and tanker or well water may be much harder. Heating and evaporation then concentrate whatever hardness is there.
Do we need to treat the whole factory?
Rarely. Most plants treat the branches feeding boilers, heat exchangers, CIP and washers, and leave general wash-down on the incoming supply.
Is softening enough if our well water is salty?
No. Softening removes hardness but not dissolved salts. High-TDS water for product or final rinse normally needs reverse osmosis.
How do we stop a tanker delivery from causing problems?
Test each new supplier, log which feed is in use, and size treatment for the hardest water you are likely to receive.
Why does the cooling tower scale faster in summer?
More water evaporates, so minerals concentrate faster. Softened make-up, inhibitor dosing and a controlled bleed keep it in check.
Talk to Sovereign Water about your line
Share your feed analyses, which sources you use and when, daily volumes, peak flows and the equipment you need to protect. Our team in the Kingdom can then discuss a treatment route for your plant.
Sources
[1] Saudi Water Authority, news and SWCC sector page: https://www.swa.gov.sa/en/news/1 and https://www.swa.gov.sa/en/related-sectors/swcc
[2] Saudi Water Authority, National Water Company sector page: https://www.swa.gov.sa/en/related-sectors/nwc
[3] MATEC Web of Conferences (ASCM 2017), paper 05002 on Saudi water supply: https://www.matec-conferences.org/articles/matecconf/pdf/2017/34/matecconf_ascm2017_05002.pdf
[4] Saudi Food and Drug Authority, investor journey to obtain a licence for food manufacture or a bottled water and ice factory: https://www.sfda.gov.sa/sites/default/files/2021-04/InvestorJourneytoObtainaLicenseforFoodManufactureoraBottledWaterandIceManufacture.pdf