comparators can emit a redstone signal when placed next to a pool, with a redstone signal of 15 when the pool is full.
if you want to turn the build off when all pools are filled, have the spreaders first send their mana to 1 pool, and have the mana be send to other mana pools through that pool. place a comparator next to it that will emit a redstone signal of 15 when it's full, and when that first mana pool is full, it means that all the other mana pools have already been filled.
I made a similar build in my creative world a few days ago using the signal busses from Tinker's Mechworks
and personally I prefer this setup for mana pool storage
it's probably not the most efficient, but mana is send to the distributor that send the mana to the adjacent 4 pools. the sparks ontop of those pools have the recessive augment, so it'll send all their mana to any nearby non-augmented sparks, and lastly the single pool has a dominant augment on it's spark, so it pulls mana from all the other pools