Pool & spa

Retail pack

£11.501 kg bottle

Raw active

Dense soda ash (sodium carbonate 99%)497-19-8

pH Plus is dense soda ash — 99% sodium carbonate, CAS 497-19-8. Pool-shop packaging turns a £2.70/kg commodity into an £11.50/kg ritual.

Retail pack

£9.991.5 kg

Raw active

Sodium bisulphate (dry acid)7681-38-1

pH Minus is dry acid — sodium bisulphate. Pool retail is a small tub; chemical suppliers sell it in 5 kg lots for a third of the per-kilo price.

Retail pack

£42.005 kg

Raw active

TCCA 90% chlorine tablets (200 g)87-90-1

The tablet is 90% TCCA — the same stabilised chlorine used in bulk 200 g pucks. ‘Multifunction’ is a pinch of clarifier and a lot of packaging. Buy TCCA, dose from an SDS, and keep cyanuric acid in range.

Retail pack

£11.991 kg tub

Raw active

Food / technical grade sodium bicarbonate144-55-8

Standard baking soda sold at a 1,200% retail markup under spa branding.

Retail pack

£13.991 kg bottle

Raw active

Calcium chloride flakes (77–80% technical grade)10043-52-4

Repackaged de-icing and industrial desiccating salt marked up tenfold.

Retail pack

£16.501 kg tub

Raw active

Technical cyanuric acid granules108-80-5

100% cyanuric acid in a 1 kg spa tub. The same granules sell in 5 kg lots at a fraction of the per-kilo price. Dose to a test kit (typically 30–50 ppm CYA), not a marketing scoop.

Retail pack

£24.501 litre

Raw active

HEDP 60% phosphonate concentrate2809-21-4

A 15% phosphonate in a 1 litre bottle. Industrial 60% HEDP is the same sequestering chemistry; 50 ml of 60% in 10,000 litres is a typical maintenance dose.

Retail pack

£34.002.5 kg tub

Raw active

Calcium hypochlorite granules 65–70%7778-54-3

This is not TCCA and it is not bottle bleach. Cal-hypo is the same oxidiser sold to commercial pools in 5–10 kg kegs. A 2.5 kg spa tub is a small pour from that keg.

Retail pack

£18.991 kg tub

Raw active

Potassium monopersulphate triple salt (MPS)70693-62-8

‘Non-chlorine shock’ is Oxone-type MPS — the same triple salt used in bulk oxidisers. A 1 kg spa tub is a markup on a 5 kg bucket. It oxidises organics; it is not a sanitiser on its own.

Retail pack

£24.001 kg tub

Raw active

BCDMH bromine tablets 20 g16079-88-2

Spa bromine tablets are BCDMH. The 1 kg tub is the same 20 g pucks sold in 5 kg tubs to holiday-park plant rooms. You still need a floater and a test kit.

Retail pack

£12.991 kg tub

Raw active

Aluminium sulphate (alum) crystals 17%10043-01-3

Floc is alum. Aluminium sulphate is a water-works coagulant sold in 5–25 kg sacks. A 1 kg spa tub is a labelled scoop from that sack. Not a sand-filter magic potion, and not polyquat. Vacuum to waste after it drops.

Retail pack

£16.502.5 kg tub

Raw active

Sodium thiosulphate pentahydrate (chlorine reducer)7772-98-7

The spa-shop ‘chlorine reducer’ is photographer’s hypo: sodium thiosulphate. A 2.5 kg tub is a small bag of the 5 kg photo/pool salt. Dose from a test kit. Too much and you will have no sanitiser left.