Sometimes I need to use a lot of sand at once when potting a plant but because I use industrial sand I worry that there are harmful substances in it so I wash it several times with a hose before using it. However, since it is about 20 pounds of sand, I don't have enough rainwater or RO water to rinse off the things in the water from the hose before using the sand.
I'm wondering which one is the lesser of the two evils: the minerals in the tap water (water in southern California has a pH of 8) or the things which might be in the sand before it is washed? So far I've been mixing the sand with peat moss made wet with RO water, but I'm still worried about the effects that some tap water might have on my plants. Or does anyone know a better way to clean sand before using it?
I'm wondering which one is the lesser of the two evils: the minerals in the tap water (water in southern California has a pH of 8) or the things which might be in the sand before it is washed? So far I've been mixing the sand with peat moss made wet with RO water, but I'm still worried about the effects that some tap water might have on my plants. Or does anyone know a better way to clean sand before using it?