It will retain more water and be heavier, but I myself think it's a good idea. I add 20% myself. I have a similar mix but use diatomaceous earth instead of perlite. It gives the aeration of perlite, but also retains water and makes it available to the plants while still maintaining air space if not saturated with water. Also it never breaks down. Perlite does in 5 years. This matters to me as I recycle my potting soil in raised beds. Seeing a number of studies convinced me to use it. Increased plant growth etc. the studies were very positive.
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