Kaydee's idea will work temporarily. We had the river rock for about 10 years, had the problem you spoke about. River rock is porous even when sealed as the water flows under it. The sealant breaks down, haze worse in the sun and rain areas. We had to reseal after 4 months, the haze was so bad. After many layers, using the proper sealant, we just decided Chattahoochee river rock was wonderful for protected areas, it just didn't hold up in the elements. We had it all jack-hammered off and resurfaced with a decorative concrete.
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