Cost of Mineral Pool System: Salt Pool Conversion Itemised

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Converting a 50,000-litre salt pool to a magnesium mineral system costs about $300–$1,450 if your chlorinator can run on minerals: roughly $85 of Sydney water to dilute the salt, plus 5–22 ten-kilo mineral bags at $42–$61.95. A new chlorinator adds $700–$2,500; packaged systems are published at $2,700–$3,500+. Vendor-published.

The short answer

First, dilute the salt. One pool-chemistry guide says salt pools run at 2,700–3,400 ppm and must come down to 1,500 ppm before minerals go in. From 3,000 ppm that is half the water: 25 kilolitres, or $85.25 at Sydney Water’s $3.41 a kilolitre.
Then the first dose: 5 to 22 bags of 10kg for a 50,000-litre pool. One retailer’s chart says 5 bags from 1,500 ppm and 15 from fresh water; the chemistry guide says about 22. The charts disagree.
Bags cost $42–$61.95 for 10kg at four Australian retailers on 2 October 2026, so the dose is $210–$1,363.
The chlorinator is the swing item. Two makers’ manuals let their units run on minerals with 20–40% more product. If yours cannot, a new chlorinator is published at $700–$2,500.
Packaged mineral systems: $2,700–$3,500+ for one maker’s full conversion, and $200–$3,500 installed across another maker’s packs.

Worked conversion cost for a 50,000-litre salt pool in Sydney at 3,000 ppm, by route (vendor-published prices, read 2 October 2026)
Line item	Keep your chlorinator	New chlorinator	Packaged mineral system	Source of the figure
Dilute the salt to 1,500 ppm	25 kL × $3.41 = $85.25	$85.25	$85.25 unless the installer quotes it	Pool-chemistry guide (1,500 ppm); Sydney Water 2026–27 usage price
First mineral dose	5–22 bags × $42–$61.95 = $210–$1,362.90	$210–$1,362.90	Ask whether the first dose is included	One retailer’s dosing chart (5 bags); pool-chemistry guide (22 bags); four retailers’ bag prices
Chlorinator or system	$0, if the manual allows minerals	$700–$2,500	$2,700–$3,500+	Pool-chemistry guide (new chlorinator); one equipment maker (system)
Pump and filtration	Unchanged	Unchanged	Unchanged unless the package adds parts	Two equipment makers
Total	$295.25–$1,448.15	$995.25–$3,948.15	$2,785.25+ before minerals	Sum of the rows above

How much does a magnesium pool cost to convert? The worked calculation

A magnesium pool conversion has three costs: the water you use to dilute the salt already in the pool, the first dose of minerals, and the chlorinator if yours cannot run on minerals. The table above works through all three for a 50,000-litre pool in Sydney.

Step 1, the water. One pool-chemistry guide says most salt pools sit at 2,700–3,400 ppm and the total dissolved solids must come down to at least 1,500 ppm before minerals go in. Dilution is simple arithmetic: the share of water to replace is 1 − (1,500 ÷ your current reading). At 3,000 ppm that is 50%, or 25,000 litres. At Sydney Water’s 2026–27 usage price of $3.41 a kilolitre, that is $85.25. At 2,700 ppm it is about $76, and at 3,400 ppm about $95. The same guide warns that in-ground pools can lift when drained, so the drain may have to be done in stages, and staged dilution uses more water than one drain and refill. Read why pools lift out of the ground before you drain, and check where the water can legally go: draining a pool to the sewer in NSW.

Step 2, the minerals. Ten-kilo bags of magnesium pool minerals were listed at $42, $50, $55 and $61.95 at four Australian retailers on 2 October 2026. The number of bags is less certain (see below): 5 bags at $42 is $210, and 22 bags at $61.95 is $1,362.90.

Step 3, the chlorinator. If it can run on minerals, this line is zero. If not, the same chemistry guide publishes new chlorinators at $700–$2,500 on average.

The quotable version: converting a 50,000-litre salt pool to magnesium costs about $300 to $1,450 when the chlorinator stays, and most of that is the first bag-load of minerals, not the equipment.

Do I need a new chlorinator for a mineral pool?

Often not, but check your own unit’s manual before buying anything. Two chlorinator makers’ manuals read on 2 October 2026 show what to look for:

One maker’s salt-and-mineral chlorinator manual says the unit can run on magnesium chloride blends, that you may need 20–30% more product to reach the same reading, and that it has a mineral setting because minerals are less conductive than salt.
Another maker’s manual says to add about 1.4 times the amount of normal salt when using mineral salt, with an optimum mineral level of 4,200 ppm against 3,000 ppm for salt.

So the test is simple: if your manual names minerals or magnesium, and lists a mineral setting or a mineral TDS range, the chlorinator can probably stay. If it says nothing, ask the maker before you dose. The chemistry guide notes most salt chlorinators run in mineral water, but that confirming with the manual or maker comes first.

Packaged systems are a different purchase. One equipment maker published its full mineral conversion at $2,700–$3,500+ on 16 March 2026, with installation priced separately by its dealers. Another maker publishes $200–$3,500 fully installed across its conversion packs, and says nothing needs replacing if the pump, filter and chlorinator are working. Neither price is comparable to the other until you know what each pack contains. Our guide to the pump, filter and chlorinator in a pool quote sets out what each line should name.

The manual rule: if your chlorinator’s manual gives a mineral setting or a mineral ppm range, the chlorinator line of a mineral conversion is $0.

How many bags of minerals does a pool need? Why the charts disagree

For the same 50,000-litre pool, two published sources give very different first doses:

One online retailer’s dosing chart says 15 bags of 10kg from 0 ppm, 5 bags from 1,500 ppm, and 2½ bags as a top-up at 2,500–3,500 ppm.
The pool-chemistry guide says about 22 bags of 10kg to reach 3,500–4,500 ppm, at an average of $50 a bag, or about $1,100.

Part of the gap is the starting point (a diluted salt pool already holds about 1,500 ppm of dissolved solids) and part is the target reading. That is why the worked calculation shows 5–22 bags and does not pick one. Ask whoever quotes the conversion which target reading they are dosing to, and how many bags that is for your pool’s volume. If you do not know the volume, the pool pump run-time guide shows how to work it out.

The quotable version: the first mineral dose for a 50,000-litre pool is published at anything from 5 to 22 ten-kilo bags, so a conversion quote that does not state the bag count is not a price.

How much does it cost to maintain a magnesium pool?

This page covers the conversion. The ongoing cost of a mineral pool against a salt pool is covered in mineral pool vs saltwater pool, which compares bag prices and consumption. Two vendor figures are worth adding here. One maker says its minerals cost about $200 a year for a 50,000-litre pool in a temperate climate. The retailer’s chart above has a top-up of 2½ bags for that pool, which is $105–$155 at the bag prices read for this page. How often you top up depends on splash-out, backwashing and rain, and no independent source publishes a figure.

The pump, filtration and chlorinator power bill does not change, so the rest of the running cost is in pool running costs per year.

Are magnesium pools worth it? The softer-water claims are vendor claims. We found no independent Australian measurement of them. On a new pool the extra cost is small, and the decision is mostly about which sanitiser the builder specifies. Ask each builder to name the chlorinator model and whether it is rated for minerals, then compare pool quotes on the same equipment line. You can also browse builders in Sydney, Brisbane and Melbourne.

Common questions

How much does a magnesium pool cost?

Converting an existing 50,000-litre salt pool costs about $300–$1,450 if the chlorinator can stay, and $1,000–$3,950 with a new chlorinator, on vendor-published prices. One equipment maker publishes its full packaged conversion at $2,700–$3,500+.

How much more expensive is a magnesium pool?

To convert, the main extra is the first mineral dose: 5–22 ten-kilo bags at $42–$61.95 each. One pool-chemistry guide puts the first dose for a 50,000-litre pool at about 22 bags, or around $1,100 at $50 a bag.

Can I use my salt chlorinator for a mineral pool?

Usually, if its manual allows it. One maker’s manual says to add 20–30% more product with minerals; another says 1.4 times the salt amount, at 4,200 ppm. If your manual does not mention minerals, ask the maker first.

Do I have to drain my pool to convert to minerals?

Partly. One chemistry guide says the dissolved solids must come down to 1,500 ppm first. From a typical 3,000 ppm salt reading that means replacing about half the water, which is 25 kilolitres for a 50,000-litre pool, or $85.25 at Sydney Water’s 2026–27 price of $3.41 a kilolitre.

Do I need a glass media filter for a magnesium pool?

Some mineral retailers specify one. One maker’s conversion page says a working pump, filter and chlorinator can stay. Check the mineral product’s instructions before changing the filter.

Sources

General information only, current at 2026-10-02. 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.

What does a mineral pool system cost?