Western Australian Consolidated Regulations

PEARLING (GENERAL) REGULATIONS 1991 - SCHEDULE 2

[Regulations 44A and 44B]

        [Heading inserted in Gazette 17 Dec 1999 p. 6224.]

Division 1  — Cleaning and disinfecting

        [Heading inserted in Gazette 17 Dec 1999 p. 6224.]

                When a hatchery, tank or piece of equipment is required to be cleaned and disinfected it is to be — 

            (a)         mechanically cleaned by a brush or high pressure spray using a solution of 10 g sodium hydroxide per litre of water at 60°C; then

            (b)         allowed to dry; then

            (c)         disinfected by — 

                  (i)         keeping the surface of the place or thing wet for at least 60 minutes using a solution of either — 

                        (I)         50-100 mg of free iodine per litre of water; or

        (II)         60 mg of free chlorine per litre of water;

                or

                  (ii)         immersing the thing for at least 60 minutes in a solution containing sufficient sodium hydrochlorite to ensure that the residual chlorine concentration of the solution after 30 minutes is at least 10 mg per litre;

                then

            (d)         rinsed using fresh water or sea water filtered — 

                  (i)         in the case of equipment to be used in the production of algal food for spat prior to settlement, to 0.2 µm; or

                  (ii)         otherwise, to 0.1 µm;

                then

            (e)         allowed to dry.

        [Division 1 inserted in Gazette 17 Dec 1999 p. 6224.]

Division 2  — Treatment of water, air and equipment

        [Heading inserted in Gazette 17 Dec 1999 p. 6225.]

1.                 Sea water to be used in the hatchery is to be treated, before it is so used, as follows — 

            (a)         water which is to be used to rear spat is to be filtered to 20 µm or finer;

            (b)         water which is to be used in the production of algal food for spat is to be autoclaved or filtered to 20 µm;

            (c)         water which is to be used for any other purpose is to be filtered to at least 20 µm using duplicate filters.

2.                 Air which is to be used in the production of algal food for spat is to be filtered, before it is so used, to 20 µm using sterile filters.

3.                 Equipment which is to be used in the production of algal food for spat is to be autoclaved, or cleaned and disinfected in accordance with Division 1, before each occasion on which it is so used.

4.                 Water to be discharged from the hatchery is to be filtered through sand or treated with a solution of 60 mg of free chlorine per litre of water before it is discharged.

        [Division 2 inserted in Gazette 17 Dec 1999 p. 6225.]