We are often asked about the interaction between polyurethane and chlorine in swimming pools. In most cases, the grout repair is behind some type of coating and would not be directly in contact with the pool water. Polyurethane products are generally susceptible to attack by high levels of sodium hypochlorite (NaOCI, above 4 – 5 % sodium hypochlorite). In a properly maintained pool, the free chlorine level is under 10 PPM (parts per million). The chlorine level when shocking a swimming pool is typically below 40 PPM. Therefore, the interaction between polyurethane and chlorine in swimming pools is minimal.
The simple answer is that Mountain Grout Products should continue to perform well and withstand proper levels of chlorine and even a chlorine shock. Mountain Grout has been used in swimming pools for decades with great success. We are also a proud member of the Master Pools Guild and offer discounts to member companies.
In the photo, installers are pumping polyurethane via a manual bucket pump into hairline cracks. They first drilled bore holes and installed injection packers for pressure grouting. Polyurethane is pumped into the crack via the packer and it reacts with the water contained in the crack. Once the polyurethane cures, it is inert and the chlorine in the filled pool will not negatively impact the grout installation.
If you have questions regarding chemical resistance of polyurethane to chemicals other than chlorine, consult our Chemical Resistance Chart.
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