Pool Liquid Chlorine 14% Sodium Hypochlorite

Industrial 14% sodium hypochlorite for swimming pools and process water. The fastest, cheapest active chlorine per pound for daily auto-dosing through a metering pump.

• Delivers 14% w/w available chlorine, the strongest grade legal for pool dosing.
• Adds 1 ppm of free chlorine per 7 ml per m³.
• Dissolves instantly with no calcium addition.
• Designed for metering pump dosing on commercial and large domestic plant.
• Runs without cyanuric acid build-up.

Sizes and prices

• 5L: £28.50
• 10L: £51.13
• 25L: £119.00

When you need it

• You run a metering pump and want the cheapest active chlorine.
• Pool is large enough that handling drums beats dosing tablets.
• Cyanuric acid is already at the upper limit and you cannot add more.
• You need to chlorinate after a fresh fill or part-drain in minutes.
• Calcium hardness is high and cal-hypo would worsen it.

How to use

1. Use a dedicated chemical-resistant feed tank and metering pump.
2. Calibrate the pump for ml-per-minute against pool turnover.
3. Confirm free chlorine setpoint of 1.5-3 ppm before going live.
4. Inject downstream of the filter and upstream of any heater.
5. Flush the injection line monthly with fresh water to clear scale.
6. Shock manual dosing: pre-dilute 1:5 in a 25 L bucket and pour evenly.

Dosing guide

Liquid strength decays with age and temperature; fresh stock holds 14% but expect 11-12% after 60 days. Recalibrate metering pumps quarterly. Sodium hypochlorite is alkaline and will raise pH; budget for matched pH Minus dosing.

• For 20 m³, add 140 ml to reach Raise 1 ppm chlorine.
• For 40 m³, add 280 ml to reach Raise 1 ppm chlorine.
• For 60 m³, add 420 ml to reach Raise 1 ppm chlorine.
• For 40 m³, add 1.4 L to reach Standard shock to 5 ppm.
• For 100 m³, add 7 L to reach Algae shock to 10 ppm.

How it works

Sodium hypochlorite solution at 14% w/w available chlorine, supplied in 5 L, 10 L and 25 L HDPE drums.

On contact with pool water, sodium hypochlorite dissociates to release hypochlorite ion and free hydroxide. The hypochlorite ion equilibrates with hypochlorous acid (HOCl), the active sanitiser; the hydroxide raises pH.

Liquid chlorine is the lowest cost per ppm of active chlorine on the market and the only practical sanitiser for daily plant room use. Tablets are too slow, granules too labour-intensive at scale.

Frequently asked questions

How much do I dose?

7 ml per m³ raises free chlorine by 1 ppm in fresh stock; expect to dose more as drums age.

Do I need a metering pump?

Strongly recommended for daily use. Manual dosing is fine for emergency shocks but not routine.

Can I store it long term?

No. Strength decays 10-20% over 90 days at 20 C and faster in summer; rotate stock.

Drum sizes?

5 L, 10 L and 25 L HDPE bottles. Bulk 200 L or 1000 L on request for plant rooms.

Is it the same as bleach?

Same active ingredient as household bleach but at twice the strength and pool-grade purity, no fragrances.

What does 14% mean?

14% w/w sodium hypochlorite, equivalent to roughly 14% available chlorine when fresh.

What is the active ingredient?

Sodium hypochlorite (NaOCl) at 14% w/w available chlorine.

Why does it raise pH?

Sodium hypochlorite hydrolyses to release hydroxide ion alongside the active chlorine.

Will it add CYA?

No. Sodium hypochlorite is unstabilised; no cyanuric acid is added.

Output dropped?

Stock has decayed; rotate drums and recalibrate pump.

pH rising?

Pair with a pH Minus dosing schedule or auto pump.

Liquid vs cal-hypo?

Liquid is cheaper per ppm and easier to auto-dose; cal-hypo stores for years and needs no pump. Liquid for daily plant rooms, cal-hypo for emergency stock.

Liquid vs TCCA tablets?

Liquid hits free chlorine instantly and adds no CYA; tablets are slow and stabilised. Liquid for plant rooms, tablets for unattended garden pools.