I wouldn't put any more in.
Not sure what putting meta-silicate in will do -- and my chemist son just drove off a few minutes ago.
But the general rule is, don't use household cleaners in pools UNLESS you KNOW what they are, and what effect they will have. More often than not, the result is a disaster. Not saying yours will be, but I don't know. You have to keep in mind that most cleaners don't list all their ingredients, and some of the unlisted ingredients can react badly in pools.
Ben

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