Robelle 25-Pounds Premium Pool Calcium Up | Pool Calcium Hardness Increaser, 100% Calcium Chloride, 8 ounces raises calcium hardness level 10 ppm per 5,000 gallons

Good quality - much cheaper than local pool supply

Cost effective, much cheaper than from the pool store, and got our water to where it needed to be!

This is a basic commodity item required for most pools. Not much product difference between brands and suppliers. This quantity from this supplier is handy and a good value.

Perfect product for our pool.

Working great, exactly as advertised. I followed the simple directions on the box to determine how much to add. Made sure to pre-dissolve in a 5gal bucket with pool water before pouring it in my pool. Measured before and after calcium levels, and the increase was exactly as expected from the directions. I am very pleased with this product. I will say, the full box was only 20LB total so I am doubting the 25LB advertising but maybe it was just mine.

Great low cost alternative to raise the water hardness in inground pools that protects the marcite/diamond bright surface from etching and erosion.

Works as advertised

Drained and refilled the pool. Needed to increase the hardness. Bought the 25# box. This product arrived in a reasonable amount of time and worked perfectly. The instructions on the bag are accurate but if you are unsure of how many gallons of water are in your pool, I would advice adding half the recommended amount, test the water, and then add the rest as needed. Much cheaper than the national pool supply house too.

وصلني المنتج مسكوب نصفه داخل الكرتون صراحة تجربة سيئة لكن تم اعادة المبلغ لي بعد تقديم شكوى لخدمة العملاء. طلبناه كبديل عن مادة كلوريد الكالسيوم Cacl2 المطلوبة في بعض التجارب الكيميائية.