Hi Qian Hu,
Quick question on the difference between Hydra 30 & 40. I'm considering one as a secondary/backup filter (i'm already using the hydra stream).
I'm aware that flow rate is higher & filter chamber is larger for the Hydra 40 (which is the reason it is spec for a larger tank size). The power consumption should be slightly higher as well for the Hydra 40.
What about the Cata-Pure cartridges used in Hydra 30 vs 40? Any difference? How many cartridges are required?
Thanks
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