I use trash bags and tuck also, which I think Garden Doc on EB started doing and it works fine. The loaf does add to the total amount of growing media available but I think one of the main reasons was to insure a tight fit for the shower cap cover which EB sold.
In my experience using synthetics both solid and liquid there is white stuff (salts) which rise to the top of my growing media. I always scrape that off and whatever I can find of the old fert strip. and then prep box for replant. Its been 8 years for some of them now.
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