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Water Chemical Suppliers
Suppliers of specialty water treatment chemicals including coagulants, scale inhibitors, biocides, and pH adjustment reagents.
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Water Treatment Chemicals: Coagulants, Disinfectants, and Antiscalants for Potable and Process Water
Water treatment chemicals are added to water during treatment or distribution to improve quality, control pathogens, prevent scale or corrosion, or remove specific contaminants. Chemicals used in potable water must hold DWI (Drinking Water Inspectorate) Regulation 31 approval (England/Wales) or equivalent WRAS certification, confirming they do not adversely affect water quality at the doses used. Primary coagulants: aluminium sulphate (alum, Al2(SO4)3.14-18H2O, liquid 8 to 10 percent Al2O3 or solid, dose 5 to 60 mg/L); polyaluminium chloride (PACl, Kemira PAX, Chemipol Superfloc, dose 1 to 20 mg/L as Al - more effective at low temperature and low pH than alum); ferric sulphate (Fe2(SO4)3, dose 5 to 50 mg/L - better NOM removal than aluminium at same dose); ferric chloride (FeCl3, similar to ferric sulphate). Coagulant aids (coagulation aids): cationic polyacrylamide (CPAM, 0.1 to 0.5 mg/L) improves floc strength and settleability; activated silica (sodium silicate, 3 to 10 mg/L) aids flocculation in cold water. UK market: Kemira, SNF Floerger, BASF, Veolia Water Technologies, Imerys are major suppliers of coagulants and flocculants.
Disinfection chemicals: chlorine (Cl2, gas, DWI-approved; liquid chlorine in 68 kg cylinders or 920 kg drums; dose 0.5 to 5 mg/L free chlorine; contact time CT 0.2 to 1.0 mg.min/L for 3 log Giardia per WHO); sodium hypochlorite (NaOCl, liquid 5 to 15 percent available chlorine, self-generated on-site by electrolysis for safety at remote sites; Grundfos MIOX, De Nora electrochlorinator); calcium hypochlorite (Ca(OCl)2, granules/tablets, 65 to 70 percent available chlorine, used in swimming pools and small emergency systems); chlorine dioxide (ClO2, on-site generated from sodium chlorite + HCl or Cl2; 0.1 to 0.8 mg/L dose; superior Cryptosporidium inactivation vs Cl2; WHO guideline 0.8 mg/L ClO2 in drinking water); monochloramine (NH2Cl, formed by adding ammonia after chlorination; lower DBP formation, better distribution system residual persistence; US EPA approved disinfectant; used by some UK water companies). pH adjustment: sulphuric acid (H2SO4, 96 percent, dose 5 to 30 mg/L for pH reduction); lime slurry (Ca(OH)2, 10 to 20 percent suspension, dose 5 to 50 mg/L for pH increase/softening); soda ash (Na2CO3, for alkalinity adjustment). Fluoride: fluorosilicic acid (H2SiF6, 25 percent, dose 0.05 to 0.2 mg/L as F; target 0.7 mg/L in fluoridated supply areas per UK Water Fluoridation Programme).
Antiscalant and corrosion inhibitor chemicals for distribution systems: orthophosphate dosing (sodium hexametaphosphate, sodium orthophosphate; 0.5 to 1.0 mg/L as P; DWI-approved; forms protective hydroxypyromorphite layer on lead pipes reducing Pb solubility by 50 to 80 percent; also forms protective iron carbonate/phosphate film on iron pipes). Scale inhibitors for RO and industrial cooling: HEDP (1-hydroxyethylidene-1,1-diphosphonic acid), polyphosphonates, polyacrylate copolymers (2 to 10 mg/L); brand names Nalco, Veolia Hydrex, Kurita, BWA Water Additives. Activated carbon (PAC, powdered; GAC, granular): PAC dose 5 to 30 mg/L for taste/odour control (threshold odour number, TON); seasonal algal bloom treatment; PFAS and pesticide control. Carbon dioxide (CO2): post-treatment recarbonation to reduce pH after lime softening, prevent calcium carbonate scaling in distribution. Key regulatory requirement: all dosing chemical stocks must have current DWI/WRAS approval (or NSF 60 for US market), current Safety Data Sheet (SDS per REACH Regulation), and site COSHH assessment.
Frequently Asked Questions
What coagulants are used in drinking water treatment?
Common coagulants for drinking water treatment with DWI/WRAS approval: (1) Alum (aluminium sulphate, Al2(SO4)3): liquid 8 to 10 percent Al2O3 or granular; dose 5 to 60 mg/L; optimum pH 6 to 7; cost-effective; residual aluminium in treated water must be less than 0.1 mg/L (DWD/DWI standard 0.1 mg/L Al); less effective below 5 degrees C; (2) Polyaluminium chloride (PACl, Kemira PAX, Chemipol): pre-polymerised; dose 1 to 20 mg/L as Al; effective at pH 5.5 to 8.5; better cold-water performance than alum; higher cost but lower residual Al; preferred in Scotland and Northern England for cold upland catchments; (3) Ferric sulphate (Fe2(SO4)3): dose 5 to 50 mg/L; optimum pH 5 to 8.5; superior NOM removal over wider pH range than alum; residual iron standard 0.1 mg/L Fe (DWI); imparts pink colour to sludge (easier dewatering); (4) Ferric chloride (FeCl3): similar to ferric sulphate; corrosive (pH of 40 percent solution approximately 0); requires corrosion-resistant storage and dosing equipment; (5) Lime (Ca(OH)2): used for softening and pH correction, not primary coagulant. Selection: jar testing at site water conditions essential; cold highland waters typically prefer PACl; warm lowland rivers with high colour may prefer ferric.
What chemicals are used to control Legionella in water systems?
Legionella control in water systems (ACOP L8, HSE guidance HSG274) uses biocides and physical treatment: (1) Chlorine (sodium hypochlorite): thermal shock chlorination at 50 mg/L free chlorine for 1 hour (emergency disinfection after Legionella isolation); continuous low-level chlorination (0.5 to 1.0 mg/L free chlorine in recirculating hot water systems) for control, with biocide residual monitoring; (2) Chlorine dioxide (ClO2): penetrates biofilm more effectively than Cl2; dose 0.2 to 0.5 mg/L continuous; generated on-site from sodium chlorite + acid; effective against Legionella at 0.1 mg/L; HSE approved for cooling towers; (3) Bromine (sodium bromide + oxidant, or BCDMH, bromo-chloro-dimethylhydantoin): alternative to chlorine for cooling towers at pH 7 to 9; effective biocide with lower corrosivity than chlorine at equivalent biocidal dose; (4) Copper-silver ionisation (20 to 400 ppb Cu + 5 to 40 ppb Ag): HSE-approved for complex water systems (hospitals, large hotels) where thermal treatment is impractical; ionisation suppresses Legionella without the scaling/corrosion risk of high chlorine; (5) Thermal treatment: hot water stored and circulated at greater than 60 degrees C; cold water maintained below 20 degrees C; Legionella is killed at greater than 60 degrees C within minutes; this physical control is the primary strategy supplemented by chemical biocides.
What is the difference between chlorine and chloramine disinfection?
Chlorine (free chlorine, Cl2 or HOCl/OCl-) and monochloramine (NH2Cl) are the two primary chemical disinfectants used in drinking water distribution: Free chlorine: stronger oxidant (higher Eo: HOCl +1.48V, Cl2 +1.36V); faster pathogen inactivation kinetics; CT value for 3 log Giardia at pH 7: 69 mg.min/L at 10 degrees C; WHO minimum residual 0.2 mg/L; reacts with NOM to form trihalomethanes (THMs, primarily chloroform) and haloacetic acids (HAAs) - UK DWI limit 100 ug/L THMs, 80 ug/L HAAs (US EPA); residual degrades within 24 to 72 hours in distribution - needs higher dose for long distribution systems. Monochloramine: formed by adding ammonia after primary chlorination (molar ratio NH3:Cl2 approximately 0.7 to 0.75:1 by weight); weaker disinfectant than free chlorine (CT 1480 mg.min/L for 3 log Giardia); forms significantly lower THM and HAA levels than free chlorine; better residual persistence in distribution (50 to 200 km long distribution systems maintain 0.5 mg/L chloramine residual); does NOT inactivate Cryptosporidium at practical doses; causes nitrification in distribution systems (NH3 released from chloramine decay feeds nitrifying bacteria - requires monitoring and flushing). UK: Thames Water and some others use chloramine in part of distribution; US: approximately 30 percent of utilities use chloramine.
How are water treatment chemicals stored safely?
Chemical storage for water treatment requires compliance with: (1) COSHH Regulations 2002 (Control of Substances Hazardous to Health): risk assessment for all chemicals; suitable containment, PPE, emergency procedures; annual review; (2) Bunding requirements (PPG26, secondary containment): liquid chemicals with volumes greater than 200 L: secondary containment (bund) holding 110 percent of the largest vessel volume (Environment Agency guidance); concrete or compatible plastic bunding; impermeable bund floor; (3) Chemical compatibility: store oxidising agents (hypochlorite) separately from reducing agents (sodium bisulphite, ferrous sulphate); acids (HCl, H2SO4) away from alkalis (NaOH, lime); chlorine gas cylinders must be stored upright in fire-resistant, ventilated room with automatic gas detection; (4) Chemical storage rooms: ventilated (minimum 4 to 6 air changes per hour), fire-resistant construction, locked, with emergency shower and eyewash (within 10 seconds walk); temperature control (hypochlorite degrades rapidly above 20 degrees C, losing 10 to 15 percent active chlorine per month at 25 degrees C vs 1 to 2 percent per month at 5 degrees C); (5) DSEAR (Dangerous Substances and Explosive Atmospheres Regulations 2002): chlorine dioxide generation areas classified as potentially explosive atmosphere (Zone 2); (6) Delivery: tanker delivery safety procedures per HSE, EA, and site safety plan; chemical delivery access 24 hours per day for emergency replenishment.
A regional water company treating 45 MLD from a chalk borehole field was failing the DWI lead-at-tap standard (greater than 10 ug/L) across 12,000 properties in a market town with pre-1970 lead service lines. Seasonal pH swings (pH 7.1 in summer to 7.6 in winter) drove variable lead solubility, and legacy aluminium sulphate dosing left residual Al above 0.1 mg/L in summer.
The chemical supplier redesigned the dosing strategy: switched coagulant from alum to PACl (Kemira PAX-XL) to reduce aluminium residual; introduced continuous orthophosphate dosing (sodium orthophosphate, 0.8 mg/L as P, DWI Reg 31 approved) to form hydroxypyromorphite on lead surfaces; installed automated pH correction (lime slurry at 1.2 percent Ca(OH)2, dosed to pH 7.6 year-round). All chemicals supplied with current SDS and COSHH assessments; bunded day tanks (110 percent secondary containment) installed for each chemical at the works.
Lead-at-tap compliance improved from 72 percent to 98.4 percent within 12 months; aluminium residual fell below 0.05 mg/L; no DWI compliance notices issued in the two years following. Annual chemical cost increased by GBP 34,000 but avoided the GBP 1.8 million cost of a planned lead service line replacement programme.
Questions to Ask Shortlisted Providers
- 1
Do all chemicals you supply hold current DWI Regulation 31 or WRAS approval for potable water contact?
UK law requires that chemicals added to drinking water must not adversely affect water quality; approval must be current, not historical.
- 2
Can you provide current Safety Data Sheets (SDS per REACH Regulation) and batch certificates of analysis for each chemical?
COSHH assessments and on-site emergency procedures must be based on current SDS; batch CoA confirms product meets specification (e.g. alum total aluminium, hypochlorite available chlorine).
- 3
What are your minimum and maximum delivery frequencies, and what is your emergency call-out response time?
Chemical supply interruptions halt treatment processes; knowing response time and whether emergency top-up delivery is contractually guaranteed is operationally critical.
- 4
How do you guarantee consistency of chemical concentration between deliveries?
Variable concentration causes dosing pump settings to become incorrect; concentration variation greater than 2 percent forces re-calibration and creates compliance risk.
- 5
What secondary containment and bunding do you require us to have in place before accepting a delivery contract?
Some suppliers require EA PPG-compliant bunding as a precondition; knowing this upfront avoids contractual surprises and ensures civil works are commissioned before first delivery.
What Drives Cost in This Category
Drinking water-grade chemicals (DWI/WRAS approved) cost 15 to 40 percent more than industrial-grade equivalents; pharmaceutical or NSF 60-certified grades carry an additional 20 to 50 percent premium.
Weekly tanker delivery on a fixed schedule is typically 10 to 20 percent cheaper per tonne than ad-hoc call-off; remote sites with access constraints carry a GBP 300 to 800 per-delivery surcharge.
Higher-concentration products (e.g. ferric chloride 42 percent vs 37 percent solution) reduce delivery volume and handling cost; switching from solid to liquid reduces on-site preparation labour.
Annual supply agreements with committed volumes typically achieve 8 to 15 percent discount versus spot purchasing; framework contracts across multiple sites achieve further economies through consolidated scheduling.
Key Regulations & Standards
Water Supply (Water Quality) Regulations 2016 (England), Regulation 31: chemicals added to drinking water must have current DWI approval; approval granted per chemical, concentration range, and water type; DWI maintains approved substances database at dwi.gov.uk.
Control of Substances Hazardous to Health Regulations 2002 (SI 2002/2677): risk assessment required for each chemical; storage, handling, PPE, emergency procedure, and health surveillance requirements; annual review of COSHH assessment mandatory.
UK REACH (SI 2020/1577): chemical suppliers must provide current Safety Data Sheets (SDS, 16-section format); registration of substances above 1 tonne per year; SVHC (Substances of Very High Concern) communication obligations; applicable to all chemical suppliers to UK sites.
Environment Agency Pollution Prevention Guidance Note 26 (chemical storage and delivery): bund capacity 110 percent of largest vessel; impermeable bund floor; roof recommended for oxidising chemicals to prevent dilution; DSEAR 2002 applies to chlorine dioxide and other flammable/explosive generation areas.