Approved products for use in the UK's public water supply

PART A: CHEMICALS AND FILTER MEDIA

INTRODUCTION

The products listed in this section are for use by water undertakers in connection with public water supplies, and cover :-

• Chemicals that can be used for the treatment and disinfection of water intended for human consumption;
• Chemicals that can be used for the treatment of assets, eg surface disinfection; and
• Filter media used in the large scale filtration of water, but not part of specific units, eg cartridge filters, membrane filtration units etc.

Two series of relevant European Standards ( EN) have now been published -

• Chemicals used for treatment of water intended for human consumption
• Products used for treatment of water intended for human consumption

As a consequence of the introduction of these EN standards treatment chemicals or products that conform with an appropriate EN standard, and that are used in accordance with any specific national condition of use (see Annex 2, sections 2.1 and 2.2 respectively) may be used without the approval of the Authorities. These standards are published by the British Standards Institute( BSi) as BSEN Standards and are available through BSi.

Products that conform to an appropriate EN standard are not subject to the approval process and are no longer listed in this publication. When new appropriate EN standards are published, products currently listed and conform to the appropriate new EN standard, will be removed from this section and temporarily listed in Annex 1 table 1.6.2.

The products listed in this section have only been assessed for their safety for use in public water supplies by water undertakers, in accordance with the relevant Instructions for Use. These products have NOT been assessed for -

(a) their efficacy or fitness for purpose in respect of any use; or
(b) their suitability for use in building water systems, including in terms of their safety when used in such systems.

IMPORTANT NOTE
Where a product based on a treatment chemical meeting the requirements of a relevant EN standard also contains other ingredients, whether or not these other ingredients meet the requirements of relevant EN standards, a formal review of the product by DWI is required before use - see Sections 1.4 and 3 of Advice Sheet 3 - http://www.dwi.gov.uk/31/pdf/Advicesheet3.pdf

The following chemicals and products are either, not covered by a relevant EN standard, or do not conform fully to the scope and/or requirements of a published EN. For all of the chemicals and products listed, the following general condition of approval applies:

It is the responsibility of the water undertaker to ensure that
(a) the method and manner of use; and
(b) the purity of these chemicals and products
are such that, in the case of water for public supply, the water treated meets the requirements of the relevant regulations). Where appropriate, additional specific conditions of approval are listed against the chemical or product.

A.1 FLOCCULANTS AND COAGULANTS

A.1.1 Products based on tannin

The dose used must not exceed 10 mg l-1 of active material.

GE Betz Ltd

WS 330/11/2 Klaraid PC 4000

A.1.2 Products based on aluminium and iron

For these products the dose must not exceed 150 mg l-1 of the product as supplied.

Clinty Chemicals Ltd

DWI 56/4/151 Ferric Aluminium Sulfate

A.1.3 Products based on iron

High Chemicals ( UK) Ltd

DWI 56/4/753 Econofloc 11

DWI 56/4/471 Econofloc 15

A.1.4 Products based on polyacrylamide

For the products listed below the following conditions apply:-

(i) no batch must contain more than 0.025% of free acrylamide monomer based on the active polymer content
(ii) the dose must average no more than 0.25mg/l and never exceed 0.50 mg/l of the active polymer
(iii) an upper limit for the content of free acrylamide monomer must be stated by the supplier for every batch
(iv) the method used for the analysis for free acrylamide monomer is that published in the series "Methods for the Examination of Waters and Associated Materials" entitled "Determination of Acrylamide Monomer in Waters and Polymers 1987" ( HMSO 1988)Method number 115. ISBN 01175 2039X

Ciba UK plc

DWI 56/4/885 Magnafloc LT20

DWI 56/4/883 Magnafloc LT22- DWI

DWI 56/4/884 Magnafloc LT22S- DWI

DWI 56/4/886 Magnafloc LT25

DWI 56/4/887 Magnafloc LT27

Kemira Chemicals b.v

DWI 56/4/893 Superfloc A100 PWG

DWI 56/4/894 Superfloc A110 PWG

DWI 56/4/895 Superfloc A120 PWG

DWI 56/4/896 Superfloc A130 PWG

DWI 56/4/897 Superfloc A137 PWG

DWI 56/4/898 Superfloc A150 PWG

DWI 56/4/899 Superfloc C-492 PWG

DWI 56/4/900 Superfloc N100 PWG

DWI 56/4/901 Superfloc N300 PWG

A.1.5 Products based on polyamine

For the products listed below the following conditions apply:-

(i) the dose must average no more than 2.5 mg/l and never exceed 5.0 mg/l as the active polymer
(ii) no batch must contain more than 40 mg/kg 3-monochloro propane 1,2-diol
(iii) the analytical system used for determining the batch content must have a limit of detection no greater than 4mg/kg. Both estimates must have at least 10 degrees of freedom and have been determined from batches of analyses carried out on not less than five separate days
(iv) the supplier must state for every batch an upper limit for the content of 3-monochloro propane 1,2-diol

Ciba UK plc

DWI 56/4/888 Magnafloc LT31

DWI 56/4/889 Magnafloc LT32

Kemira Chemicals b.v

DWI 56/4/902 Superfloc C573

Nalco Europe b.v

DWI 56/4/905 ¹Nalco 71223

DWI 56/4/906 ¹Nalco 71225

¹indicates products which also contain a coagulant based on aluminium

A.1.6 Products based on polyDADMAC (Polydiallyldimethyl ammonium chloride)

For the products listed below the following conditions apply:-
(i) the dose must not exceed 10 mg/l of active polymer

Ciba UK plc

DWI 56/4/890 Magnafloc LT35

DWI 56/4/891 Magnafloc LT37

DWI 56/4/892 Magnafloc LT38

Kemira Chemicals b.v

DWI 56/4/903 Superfloc C587

DWI 56/4/904 Superfloc C592

A.2 ADSORBENTS

The contact bed containing the product must be adequately backwashed in accordance with the Instructions for Use document and then rinsed with 5 bed volumes of water passed downflow to waste.

GEH Wasserchemie Gmbh

DWI 56/4/378 GEH ferric hydroxide

Lanxess Deutschland GmbH

DWI 56/4/496 Bayoxide E 33P

Purolite International Ltd

DWI 56/4/421 Macronet - MN200

A.3 ION EXCHANGE RESINS SYSTEMS

A.3.1 Ion exchange resins

Orica UK Ltd - Watercare Europe

DWI 56/4/550 MIEXDOC Resin

Purolite International Ltd

DWI 56/4/63 Purolite A520E nitrate selective anion exchange resin

Rohm and Haas ( UK) Ltd

DWI 56/4/758 AMBERLITE PWA5

DWI 56/4/63 IMACHP 336

DWI 56/4/63 IMACHP 555

A.3.2 Ion exchange resin based processes

BOC

DWI 56/4/467 IXL Process

A.4 DISINFESTATION, DISINFECTION OR CLEANING AGENTS OF WATERWORKS APPARATUS AND DISTRIBUTION SYSTEMS

During the approval process there is no evaluation of a product's effectiveness, only of its safety in use. An approval given in this publication does not certify that the UK Authorities are satisfied that that the product is effective, but only that it is safe for use in accordance with the Instructions for Use supplied.
The fact that a product is approved does not justify any claim about its effectiveness.

Permission or consent for disposal of any wastewater generated to a sewer or watercourse must be obtained from the relevant water Service Company,or Environment Agency in England and Wales or Scottish Environment Protection Agency ( SEPA) in Scotland as appropriate.

Aquabiotics Pty Ltd

DWI 56/4/642 BoreSaver Liquid

DWI 56/4/641 BoreSaver Ultra C

Carus Chemical Company

DWI 56/4/631 Carusol 20 Liquid Permanganates

DWI 56/4/631 Carusol 40 Liquid Permanganates

EPSCO Ltd

WS 34/1/144 Carela Bio-Des

WS 34/1/144 Carela Bio-Plus

DWI 56/4/437 Carela Bio-Plusforte

DWI 56/4/578 Carela Novopur

DWI 56/4/380 Carela RS 100

Floran Technologies Inc

DWI 56/4/754 Floran Biogrowth Remover/Floran Catalyst

DWI 56/4/754 Media Master/Floran Catalyst

Panton McLeod Ltd

DWI 56/4/212 PM33

DWI 56/4/212 PM55

DWI 56/4/212 PM88

Permacare - Membrane Separations Group

DWI 56/4/385 Resintreat

R. Spane GmbH

DWI 56/4/730 Carela FIX & DES

Tevan BV

DWI 56/4/844 TEVAN Panox
For this product the following applies:

This product shall be rinsed until the concentration of Hydrogen Peroxide is 0.1mg/l or less.

For the following products the following conditions apply:

Current approval for the use of products containing silver salts in relation to emergency disinfection of water intended for human consumption is subject to the following conditions of approval:

• the concentration of silver in the water does not exceed 80 µg l ^-1; and
• consumers are exposed to water containing silver for only as long as necessary to restore conventional treatment, and for no more than a total of 90 days in any period of a year.

These conditions ensure that there is only a limited exposure of the consumer to silver.

ROAM Chemie NV

DWI 56/4/573 Huwa-San TR50

Tevan BV

DWI 56/4/381 TEVANSIL

Water Treatment Products Ltd

DWI 56/4/211 Sanosil Super 25

A.5 DISINFECTION OR CLEANING AGENTS OF MEMBRANES

During the approval process there is no evaluation of a product's effectiveness, only of its safety in use. An approval given in this publication does not certify that the Authorities are satisfied that that the product is effective, but only that it is safe for use in accordance with the Instructions for Use supplied.
The fact that a product is approved does not justify any claim about its effectiveness.

Ashland Drew Industrial Division

DWI 56/4/473 AmeROyal 363

Atkinson Chemicals Ltd

DWI 56/4/495 Kinro 1020

DWI 56/4/495 Kinro 1020D

DWI 56/4/524 Kinro 1406

DWI 56/4/524 Kinro 1406N

DWI 56/4/375 Kintrol 556

DWI 56/4/375 Kintrol 556C

Avista Technologies ( UK) Ltd

DWI 56/4/458 Delro 35

DWI 56/4/582 Delro 40

DWI 56/4/737 RoClean 111

DWI 56/4/870 RoClean L403

DWI 56/4/800 RoClean L404

DWI 56/4/824 RoClean L607

DWI 56/4/746 RoClean P303

DWI 56/4/868 Vitec 2000

DWI 56/4/457 Vitec 3000

DWI 56/4/582 Vitec 4000

DWI 56/4/458 Vitec 5000

DWI 56/4/801 Vitec 7000

DWI 56/4/869 Vitec 7000a

GE Betz Ltd

DWI 56/4/388 Hypersperse MDC150

DWI 56/4/388 Hypersperse MDC220

Genesys International Ltd

DWI 56/4/664 Genesol 38

DWI 56/4/665 Genesol 40

DWI 56/4/577 Genesys HR

DWI 56/4/495 Genesys LF

DWI 56/4/783 Genesys LF60

DWI 56/4/781 Genesys LS

DWI 56/4/610 Genesys MG

DWI 56/4/593 Genesys SI

DWI 56/4/524 Genesys SW

Gulf Specialized Water Services Company

DWI 56/4/534 GulfChem GS300

DWI 56/4/534 GulfChem GS500

DWI 56/4/534 GulfChem GS510

DWI 56/4/534 GulfChem GS520

DWI 56/4/534 GulfChem GS530

Permacare - Membrane Separations Group

DWI 56/4/326 Permaclean 77

DWI 56/4/326 Permaclean 99

DWI 56/4/463 PermaTreat 191

DWI 56/4/385 Resintreat

Rohm and Haas ( UK) Ltd

DWI 56/4/481 Acumer 1100

DWI 56/4/481 Acumer 4035

DWI 56/4/481 Acumer 4450

DWI 56/4/481 Acumer 4800

Water Treatment Products Ltd

DWI 56/4/821 WTPRO 411

DWI 56/4/822 WTPRO 413

A.6 DISINFECTANTS FOR EMERGENCY USE

Disinfectants for emergency use are no longer approved and listed under the requirements of Regulation 31(4)(a). Guidance upon the choice and use of disinfectants in an emergency is provided in Advice Sheet 9 ( http://www.dwi.gov.uk/31/pdf/Advicesheet9.pdf).

Approvals of previously listed disinfectants for emergency use have been revoked - see Information Letter 08/2008 ( http://www.dwi.gov.uk/regs/infolett/2008/info0808.shtm)

A.7 PRODUCTS BASED ON TRADITIONAL CHEMICALS

A.7.1 Traditional Chemicals

The following traditional chemicals (not covered by a specific BSEN) are considered by DWI to be unobjectionable on health grounds for the treatment of water.

For products in this section the following general condition applies:
The method of use and the purity of these products shall be such that, in the case of water for public supply, the water so treated meets the requirements of the relevant Regulations.

Calcium chloride

Calcium sulphate

Citric acid (food grade) - for use only in cleaning of membranes

Crushed flint ( e.g. Flintag)

Ferrous chloride

Magnesium carbonate

Magnesium hydroxide

Magnesium oxide

Magnesium sulphate - use only for re-mineralisation with RO membrane systems

Magnetite (Iron oxide (Fe ₃O ₄))

Products supplied as mixture of magnesium hydroxide and magnesium oxide

Sodium chloride

Sodium sulphate

A.7.2 On-site electrolytic generation of chlorine ( OSEC)

Products in this section are not fully covered by EN 901 and must conform to the following conditions of use:

(i) the method of use and the purity of the output of these products shall be such that, in the case of water for public supply, the water so treated meets the requirements of the relevant Regulations, and
(ii) the treated water must not contain more than 700 µg/l chlorate.

Aztec Environmental Controls

WS 34/1/82 Sodium hypochlorite generated by the ElectroCell Process

Proton Water Services Ltd

DWI 56/4/717 PRO- SEC System

DWI 56/4/864 Selcoperm

Severn Trent Services Ltd

DWI 56/4/549 Clortec cell

Wallace and Tiernan Ltd

DWI 56/4/775 Sodium hypochlorite generated by the OSEC system

Waterman Environmental Services Ltd

DWI 56/4/545 MIOX Electrolytic Sodium Hypochlorite Generators

A.8 DISINFESTATION AGENTS

During the approval process there is no evaluation of a product's effectiveness, only of its safety in use. An approval given in this publication does not certify that the Authorities are satisfied that that the product is effective, but only that it is safe for use in accordance with the Instructions for Use supplied.
The fact that a product is approved does not justify any claim about its effectiveness.

Bournemouth and West Hampshire Water Plc

DWI 56/4/720 Permasect WT for use in disinfestation of mains

For this product the following conditions apply:
(i) the dose applied must not cause the average and maximum concentration of permethrin or pyrethrins in water to exceed 10 and 20 m g l ^-1 respectively;
(ii) the period of dosing should be kept to a minimum and must never exceed 7 days;
(iii) adequate account shall be taken of those water uses likely to be affected by thepresence of permethrin or pyrethrins in water;
(iv) any water company proposing to use the product must give prior notificationto the Authorities in accordance with agreed procedures; and
(v) permission or consent for disposal of any wastewater generated to a sewer orwater course must be obtained from the relevant water service company or Environment Agency in England and Wales or Scottish Environment Protection Agency ( SEPA) in Scotland , as appropriate.

DWI 56/4/720 Permasect WT for use in application to slow sand filters

For this product the following conditions apply:

(i) the dose must not exceed 100µg/l and the residual must not exceed 0.1µg/l in the treated water;
(ii) the period of dosing should be kept to a minimum and must never exceed more than once in a 28 day period;
(iii) prior to dosing, the water undertaker must establish that the filter bed to be dosed is intact and free from defects that would permit short-circuiting of normal flow pattern;
(iv) monitoring of permethrin in the final treated water entering supply must be carried out at daily intervals during the first 7 days following commencement of dosing; and
(v) permission or consent for disposal of any wastewater generated to a sewer or water course must be obtained from the relevant water service company orEnvironment Agency in England and Wales or Scottish Environment Protection Agency ( SEPA) in Scotland , as appropriate.

A.9 OTHER CHEMICALS

Lithium Salts

For this product the following condition applies:
The use of lithium salts for meter calibration in water mains is acceptable providing that the maximum concentration of lithium in water supplied to consumers does not exceed 0.10 mg l ^-1 at any time (the analytical method used for lithium determination should have an accuracy better than ±0.01 mg l ^-1 at 0.10 mg l ^-1)

Singleton Birch Ltd

For these products the following condition applies:
The final water should not exceed 1 NTU ( NTU=nephlometric turbidity unit)

DWI 56/4/518 Hydrogel 20

DWI 56/4/518 Hydrogel 30

DWI 56/4/518 Hydrogel 50

A.10 FILTER MEDIA

Dryden Aqua Ltd

DWI 56/4/382 Advance Filtration Media ( AFM)