How to Raise Pool Chlorine: Dose by Product Strength

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To raise pool chlorine, add 10 g of available chlorine per 10,000 litres for each 1 mg/L: 80 mL of 125 g/L liquid chlorine or 14.3 g of 700 g/kg granular. A 50,000 L pool from 0.5 to 3 mg/L takes 1 litre of liquid chlorine. SA Health’s home range is 1.0–3.0 mg/L free chlorine.

The short answer

The rule: 10 g of available chlorine raises 10,000 L by 1 mg/L. Divide by the product’s strength: 80 mL of 125 g/L liquid, 14.3 g of 700 g/kg calcium hypochlorite, 20 g of 500 g/kg dichlor.
Strengths are set nationally: the APVMA home-pool standard allows liquid at 100–130 g/L, calcium hypochlorite 650–700 g/kg, dichlor 500–630 g/kg and trichlor tablets 800–900 g/kg. Read your label’s figure.
Worked: 50,000 L from 0.5 to 3.0 mg/L is 125 g of chlorine: 1.0 L of 125 g/L liquid, 179 g of 700 g/kg granular, or 250 g of 500 g/kg dichlor.
What else goes in: each 1 mg/L from dichlor adds about 0.9 mg/L of stabiliser, from trichlor about 0.6, and from calcium hypochlorite about 0.7 mg/L of calcium hardness (chemistry).
Targets: 1.0–3.0 mg/L free, ideal 2 (SA Health); in a stabilised outdoor pool at least 2 mg/L below 26°C and 3 above (HealthyWA).

The chlorine dose ladder by product strength: product needed per 10,000 L for each 1 mg/L, and to raise a 50,000 L pool from 0.5 to 3.0 mg/L (strength bands from the APVMA home pool and spa products standard; arithmetic 10 g available chlorine per 10,000 L per mg/L; read 18 October 2026)
Product	Allowed strength	Per 10,000 L per 1 mg/L	50,000 L, +2.5 mg/L	Also adds
Liquid chlorine (sodium hypochlorite)	100–130 g/L	100 mL at 100 g/L; 80 mL at 125 g/L; 77 mL at 130 g/L	1.25 L at 100 g/L; 1.0 L at 125 g/L	No stabiliser or calcium; loses strength in storage
Granular calcium hypochlorite	650–700 g/kg	15.4 g at 650; 14.3 g at 700	192 g at 650; 179 g at 700	Calcium: about 0.7 mg/L hardness per 1 mg/L chlorine (chemistry)
Lithium hypochlorite granules	350 g/kg	28.6 g	357 g	No stabiliser or calcium
Dichlor granules (sodium dichloroisocyanurate)	500–630 g/kg	20 g at 500; 15.9 g at 630	250 g at 500; 198 g at 630	Stabiliser: about 0.9 mg/L per 1 mg/L chlorine
Trichlor tablets	800–900 g/kg	12.5 g at 800; 11.1 g at 900	Not a quick raise: slow dissolving	Stabiliser: about 0.6 mg/L per 1 mg/L chlorine

How do I raise the chlorine in my pool? Dose, add half, retest

The arithmetic is the same for every product. One mg/L is one gram per 1,000 litres, so raising 10,000 L by 1 mg/L takes 10 g of available chlorine. Divide by how much available chlorine the product carries, which the label must state.

Test free chlorine and pH. NSW Health’s 2026 guidelines say higher pH reduces how much of the chlorine is in its strong form, so fix pH above 7.6 first (how to lower pH).
Pick the target. SA Health’s home range is 1.0–3.0 mg/L, ideal 2. A stabilised outdoor pool needs at least 2 mg/L below 26°C and 3 above, HealthyWA says.
Work out the dose: product = rise in mg/L × litres ÷ 10,000 × (10 ÷ strength). Strength is g/L for liquid, g/kg for solids, divided by 1,000.
Add it in the evening, when the pool is not in use, as the APVMA label template directs, with the pump running; dissolve granules in a bucket first.
Retest after circulation and top up the shortfall.

Worked example. 50,000 L at 0.5 mg/L, target 3.0: 2.5 × 5 × 10 = 125 g of chlorine, which is 125 ÷ 125 = 1.0 litre of 125 g/L liquid chlorine, or 125 ÷ 0.7 = 179 g of 700 g/kg granular.

Pool volume	Raise 1 mg/L	Raise 2 mg/L	Raise 3 mg/L
30,000 L	0.24 L	0.48 L	0.72 L
50,000 L	0.40 L	0.80 L	1.20 L
70,000 L	0.56 L	1.12 L	1.68 L

That table is for 125 g/L liquid; scale by 125 ÷ your label strength. The 10-gram rule: every 10 g of available chlorine raises 10,000 litres by 1 mg/L, whatever the product.

How to raise pool chlorine quickly

Use a product that is already dissolved or dissolves fast. Liquid chlorine is in solution as it leaves the bottle. One maker describes its 700 g/kg calcium hypochlorite as fast dissolving; another maker’s 70% product is described on its fact sheet as not totally soluble and slow dissolving, so check the label. Trichlor tablets are the wrong tool: one maker’s page calls them slow dissolving and intends one tablet per 20,000 L in a floater for maintenance.

Liquid chlorine weakens on the shelf. NSW Health says improper storage can quickly degrade the concentration of stock chlorine solutions, and one maker’s safety data sheet says the solutions slowly decompose with heat and light. An old drum gives less than its label, which is another reason to add half and retest.

Compare the label doses with the ladder: the APVMA label template’s daily dose for a stabilised pool, 200 mL of liquid per 10,000 L, is about 2.5 mg/L at 125 g/L; 40 g of 700 g/kg granular is about 2.8 mg/L. SA Health’s shock example, 200 mL of 12.5% liquid or 30 g of granular per 1,000 L for 10 mg/L, works out by the same arithmetic at about 25 and 20 mg/L; SA Health does not say why it is larger, so test before and after a shock rather than relying on the example.

Which chlorine adds stabiliser or calcium to my pool?

HealthyWA says liquid chlorine and calcium hypochlorite provide only chlorine, while dichlor and trichlor add a mixture of chlorine and stabiliser. By the chemistry, each 1 mg/L of chlorine from dichlor brings about 0.9 mg/L of cyanuric acid, and from trichlor about 0.6. At the APVMA label template’s daily dichlor dose of 10–25 g per 10,000 L (0.5–1.25 mg/L of chlorine at 500 g/kg), stabiliser rises about 0.46–1.1 mg/L a day, or roughly 14–34 mg/L a month, so a pool started at 30 mg/L reaches the 50 mg/L health limit in roughly 2½ to 6 weeks of daily dosing; the APVMA label template tells users to switch to unstabilised chlorine once stabiliser reaches 100 mg/L, double the health figure. How to lower pool stabiliser covers getting it back down.

Calcium hypochlorite adds calcium: about 0.7 mg/L of calcium hardness per 1 mg/L of chlorine by the chemistry, while one maker’s fact sheet puts it at 8 mg/L for every 120 g per 10,000 L (about 0.95). One maker’s page warns that it raises calcium hardness and can cause temporary cloudiness; in a hard-water area, how to lower pool hardness explains why that matters. Calcium hypochlorite is also strongly alkaline (pH 10–12 on one maker’s page), so expect to add acid.

Why won’t my pool chlorine go up?

If a correct dose disappears within hours, something is consuming it. Three checks, in order:

Stabiliser. In an outdoor pool with none, HealthyWA says sunlight rapidly breaks down chlorine. How to raise pool stabiliser has the dose.
Chlorine demand. Algae, debris or chloramines use chlorine up. If total minus free is above 1 mg/L, NSW Health’s fix is shock dosing to 10 times the combined level; the algae page has the shock and swim thresholds, and how to lower pool chlorine explains free versus total.
The chlorinator. In a salt pool, low salt, cold water, a scaled cell or a worn one all look like low chlorine; why a chlorinator stops making chlorine tests them cheapest first.

Hand-dosing holds the level while you find the cause. If the cause is a worn or undersized chlorinator, salt cell replacement cost prices the part, and you can compare pool quotes for a replacement rated for your pool’s volume.

Common questions

How much liquid chlorine do I add to raise chlorine by 1 ppm?

80 mL per 10,000 litres of 125 g/L liquid chlorine, or 100 mL at 100 g/L. Products are made at 100–130 g/L under the APVMA home pool and spa products standard; check your label.

How do I raise chlorine in my pool quickly?

Use liquid chlorine, which is already dissolved, with the pump running: 1 litre of 125 g/L raises 50,000 L by 2.5 mg/L. Retest after it has circulated.

How much granular chlorine raises 10,000 litres by 1 ppm?

14.3 g of 700 g/kg calcium hypochlorite, or 15.4 g at 650 g/kg. Dichlor at 500 g/kg takes 20 g and also adds about 0.9 mg/L of stabiliser.

What should my pool chlorine level be?

1.0–3.0 mg/L free chlorine, ideally 2, on SA Health’s home-pool guidance. HealthyWA asks for at least 2 mg/L below 26°C and 3 above in a stabilised outdoor pool.

Why does my chlorine keep dropping?

Usually no stabiliser in sunlight, chlorine demand from algae or chloramines, or a chlorinator not producing. Test stabiliser and total chlorine before adding more.

Sources

General information only, current at 2026-10-18. Pool rules differ by state and by council, and penalty amounts are updated regularly. Confirm your own obligations with your council or a registered inspector before acting.