Robelle Calcium Hardness Increaser

Calcium hardness prevents your pool water from becoming aggressive. If levels are too low, the water will essentially 'seek' calcium from your pool's surfaces and equipment, leading to etching, pitting, and corrosion.

You should test your water using a reliable test kit or strips. Generally, the ideal range for calcium hardness is between 200 and 400 parts per million (ppm). If your test results fall below this range, you need to add a hardness increaser.

Yes, this is suitable for most swimming pools, including concrete, plaster, and vinyl liner pools. However, always follow the dosage instructions carefully to avoid over-saturation, which can lead to cloudy water or scale buildup.

For the best results, broadcast the granules evenly across the surface of the deep end while the pool pump is running. Avoid adding it directly to the skimmer, as this can cause the product to dissolve too quickly in the plumbing.

It is best to wait at least 4 to 8 hours after application to allow the product to fully dissolve and circulate throughout the pool. Always check your water chemistry again before letting anyone swim.