We need to find a nontoxic concrete sealer. We have a child with respiratory problems.
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We had water and mold problems. The basement had perimeter drains and a sump pump leading to new outside drainage and a dry well. There is both old and new cement in the basement. Den completely dug up: gravel, new concrete, french drains and sump pump. We plan on using tile for the new floor. Do I need concrete sealant?
I would definitely seal the floor. A concrete basement floor (or any concrete) will continually "off-dust" for its entire life. The floor will never not be dusty.
There is a great sealer called Trojan Masonry Sealer. From their website: "easy to apply and is non-toxic, non-flammable, non-hazardous, low VOC (11.67 g/L) and water soluble." They are based on the East Coast and should have suppliers in your area.
I know you are planning to put down tile as well. I would still seal the concrete. Air flows (like water) in mysterious and unseen ways. It is best to seal what you can, especially if there are people living in the house who are sensitive.
Before you choose a type of sealer from the supplier, tell them you are planning to tile over it -- just to make sure there is no conflict of products.