Basically, I would estimate you would need maybe a maximum of $1,200 a month to live in the Philippines. If you can make $1,200 a month or if you have access to $1,200 a month, you can live pretty easily here.
Rectified means the edges are ground true and that does nothing for the flatness. That type of tile even though it may be high quality, must have a grout joint to hide the un-eveness of the surface or you have to be able to live with a certain amount of lippage.
Devitrification(noun) the act or process of devitrifying, or the state of being devitrified. Specifically, the conversion of molten glassy matter into a stony mass by slow cooling, the result being the formation of crystallites, microbites, etc., in the glassy base, which are then called devitrification products.