Such + adj + uncountable noun?

Dear friends,

You know, in English, we have a rule:

…such + a/an + adj + countable noun + as… (1)

Ex: She is such a pretty girl as her mother.

This sentence means: She is as pretty a girl as her mother.

So, is the rule (1) is applicable with uncountable noun? For example, can I say:

It isn’t such nice water as it seems.

and can I say that this sentence has the same meaning with:
It isn’t so nice water as it seems.

Many thanks.

Van Khanh

Hi Van Khanh

Your “such + a/an + adj + countable noun + as” rule could be used this way:

“Such a beautiful day as today shouldn’t be spent indoors.”
“Such monumental stupidity as his ought to be outlawed.”

The word “so” is usually followed by an adjective without a noun.
You could say:
“The water isn’t so nice.”
“The water isn’t as nice as it seems.”
“It was such nice water I drank three bottles of it.”