Pool Lab 3-Bag Reagent Set - Chromatalyzer ASP, Puresilk & Hayward Chlorinators 55703

Pool Lab 3-Bag Reagent Set - Chromatalyzer ASP, Puresilk & Hayward Chlorinators 55703

Genuine Pool Lab reagent set, stock code 55703, supplied as three bags. These are the consumable reagents that feed the Chromatalyzer's automatic testing head, letting the unit measure free chlorine and pH and dose accordingly. Without fresh reagent the unit cannot read your water, and it cannot control it.

• Physically Stocked, unlike most "drop-shipping" websites.
• Shipped from VIC, NSW, WA, QLD

What This Set Does

The Chromatalyzer is an automatic sensing chlorinator. Rather than relying on a probe, it draws a small water sample and performs a genuine colourimetric chemical test on it — the same chemistry a pool shop uses, run continuously and unattended. The reagents are what make that test possible. This is why these units hold water balance more tightly than probe-only systems, and also why they stop working properly the moment the reagent runs low.

How Long A Set Lasts

• Approximately 500-750 tests per set
• 6 to 8 months of water management on a standard residential pool
• Heavier bathing loads, longer run times or more frequent test cycles will shorten this

Those are the manufacturer's figures for typical domestic use. A commercial installation or a heavily used pool should expect to replace reagent more often.

Signs You Need New Reagent

• The unit reports low reagent, or flags a test or reagent fault
• Readings have started drifting, or no longer agree with a manual test kit or pool shop result
• Chlorine or pH is being over- or under-dosed with no other explanation
• Six or more months have passed since the last set went in

If readings look wrong, replace the reagent before you start suspecting the unit itself. Depleted or expired reagent is by far the most common cause of a Chromatalyzer that has "stopped working properly", and it is the cheapest thing to rule out.

Storage & Handling

• Reagents are a dated consumable with a finite shelf life — check the date before fitting, and buy what you will use rather than stockpiling
• Store cool, dry and out of direct sunlight; heat in a hot equipment shed degrades reagent quickly
• Fit a complete fresh set. Do not top up or mix old reagent with new — partly degraded reagent will skew the readings of the whole batch
• Follow the unit's own instructions for purging and priming the lines after a reagent change

Fits These Units

• Pool Lab Chromatalyzer ASP
• Puresilk Chromatalyzer — the same unit under Puresilk branding
• Hayward-badged Chromatalyzer chlorinators

The Chromatalyzer has been sold under several brand names over the years. If your controller carries a different badge but takes three reagent bags, it is very likely the same machine — send us a photo of the unit and the reagent bay and we will confirm before you order.

Frequently Asked Questions

Is this the genuine Pool Lab reagent?
Yes. These are the patented Pool Lab reagents made for this unit, not a generic substitute.

Can I use ordinary pool test reagents or DPD tablets instead?
No. The Chromatalyzer is calibrated to this specific reagent chemistry and concentration. Substituting anything else will give false readings and cause the unit to dose incorrectly.

How many bags come in the set?
Three — this is the complete set the unit takes, not a single refill bag.

Does it test anything besides chlorine and pH?
No. This reagent set covers free chlorine and pH. Total alkalinity, calcium hardness and stabiliser still need separate testing.

Common search terms: Pool Lab 55703, 3 bag reagent set, Chromatalyzer reagent, Chromatalyzer ASP reagents, Puresilk Chromatalyzer reagent set, Hayward Chromatalyzer reagent, Pool Lab ASP reagent refill, automatic chlorinator reagent, 20-32650-1.

Before You Order

Confirm this reagent set is the correct one for your controller. If you are unsure, seek professional assistance or contact us with photos of your unit, the model badge, serial number and any labelling. As with all water treatment products, follow the manufacturer's handling instructions and keep reagents out of reach of children.