You got it -- ER design with more economical materials. Gate valve a must. I don't own one (I have a ER), but most people who have them love them. Just make sure you plan to use it in sump and that you don't plan on adding ozone later -- if either of these is true you might want to go the extra bucks for the ER since I've read that the ASMs can leak just a little and that the PVC won't hold up well to ozone long term.
thanks for the info im going to get the G2 for my 75g that ought to do the job. and do the mod. with the gate valve. thanks again for the quick responce
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