Simply getting a 2215 will not solve the problem. If 2213 getting clogged every month, if you get 2215, it may end up getting clogged every month as well (even though 2215 has more filter area, higher filter speed means it will suck in large particles faster than 2213 and end up clogging just as fast).
In addition to 2215, you might need:
(1) get a fine mesh cover for filter intake (also prevent shrimps entering)
(2) get a Eheim prefilter filled with Eheim mech or cheaper equivalent
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