This (per 4 250) has the following advantages over the non-professional 150 versions:- Easier to clean due to the hose mechanism design and you re-tighten the shells up and out of the filter. No water drops anywhere. Much higher flow rate. This is to be expected, but keep in mind that the difference in price is negligible. Now that I have the eheim 150 I would never put it in a tank larger than 10 gallons even though it is rated for 40 gallons. It's just not true if you want a decent stream. - booster pump. Oh my god this saves so much pain from restarting the filter after cleaning. - Flow lever at front top. - Possibility to bypass the white filter if it is clogged and you are waiting for a new one. This is a selector pin. - All-in-one heating is available in the "t" (250 t) version. You don't have to hang one in your aquarium. Very useful when you want a smooth, rimless look in your aquarium.
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