How often should I shock?

Once a week in summer, every two weeks in shoulder seasons, immediately after thunderstorms or heavy bather use.

Standard shock or algae shock?

Standard 5 ppm for routine; 10 ppm for visible algae; 20 ppm for black-spot or yellow algae.

Will it raise my CYA?

No. This is unstabilised cal-hypo; no cyanuric acid is added.

How is it different from cal-hypo granules?

Same active ingredient, but supplied in 1 kg pre-measured shock sachets for tidy weekly dosing.

5 kg and 10 kg cartons of 1 kg sachets.

Can I use it in a vinyl pool?

Yes if you pre-dissolve in a bucket; never broadcast dry granules onto a vinyl liner.

What is the active ingredient?

Calcium hypochlorite at 65% available chlorine, unstabilised.

Stabilised shocks cannot break chloramines once CYA is over 50 ppm; you need bioavailable chlorine to oxidise.

Increase shock to 20 ppm; brush walls; vacuum dead algae to waste, not back through filter.

Dose pH Minus to bring pH back to 7.2-7.6 within 4 hours.

Chlorine shock vs MPS shock?

Chlorine kills algae and bacteria; MPS oxidises organic load only. Use chlorine for algae, MPS for routine clarity.

Chlorine shock vs rapid shock tablets?

Granules dissolve in minutes for whole-pool shocks; tablets target individual problem zones via skimmer.

Pool Chlorine Shock Granules - Rapid Dissolve

Name: Pool Chlorine Shock Granules - Rapid Dissolve
Brand: ClearSpa
SKU: psh-1
Availability: InStock
Rating: 5.0 (5 reviews)

Fast-acting unstabilised chlorine shock granules for pools. Hits 10 ppm in minutes to break chloramines, kill algae and clear cloudy water without adding stabiliser.

Lifts free chlorine to 10 ppm in minutes for a standard shock.
Breaks chloramines and restores breakpoint chlorination.
Kills early algae blooms before they bind to surfaces.
Clears organic load after thunderstorms or heavy bather use.
Adds no cyanuric acid, ideal for high-CYA water.