How much SDIC raises chlorine by 1 ppm?

1.4 g per 1000 L raises free chlorine by 1 ppm.

Yes. SDIC is the pH-neutral chlorine donor used worldwide for daily dosing.

How long until I can bathe?

Wait until free chlorine drops below 5 ppm; usually 60 minutes after a top-up.

How long does a 1 kg pack last?

Around 6-12 months of weekly maintenance for a 1500 L hot tub.

Will SDIC work in salt systems?

Yes. The granules supplement salt chlorination during heavy bather load.

Can I shock with SDIC?

Yes. Dose 5 ppm of free chlorine for a routine shock or 10 ppm for a heavy shock.

What is the active ingredient?

Sodium dichloroisocyanurate dihydrate (SDIC) at >= 56% available chlorine.

Why does SDIC not affect pH?

The dichloro-cyanurate ion is balanced between acidic and basic groups, so pH stays in band as the granules dissolve.

Does SDIC raise stabiliser?

Yes. Each 10 ppm of free chlorine added by SDIC adds approximately 6 ppm of cyanuric acid.

Chlorine not climbing?

High combined chlorine; shock at 10 ppm and run circulation for 4 hours.

Cloudy water after dosing?

Dose was added neat or pH out of band; rebalance and clean filter.

Switch to calcium hypochlorite for shocks; refresh part of the water if CYA above 80 ppm.

SDIC vs TCCA tablets?

SDIC is fast-dissolving, pH-neutral granules for daily and shock dosing. TCCA is slow-release, acidic tablets for low-effort dispensing.

SDIC vs calcium hypochlorite?

SDIC is stabilised and gentle on pH. Calcium hypochlorite is unstabilised, faster acting, and raises pH; better for indoor pools and CYA-saturated water.

Stabilised Chlorine Granules SDIC

Name: Stabilised Chlorine Granules SDIC
Brand: ClearSpa
SKU: ws-4
Availability: InStock
Rating: 4.5 (6 reviews)

Stabilised chlorine granules that dissolve fast for instant top-ups and pH-neutral shocks. SDIC adds 1 ppm of free chlorine per 1.4 g per 1000 L without raising pH.

Adds 1 ppm of free chlorine per 1.4 g per 1000 L.
Dissolves fully in 60 seconds, with no residue.
pH-neutral, so balance is preserved after dosing.
Stabilised against UV burn-off with built-in cyanuric acid.
Suitable for daily top-ups, weekly shocks and post-fill chlorination.