Quote: Originally Posted by jackson6745 I've used the mag 3, 5, 7, 9.5, and 12. They work ok but must be cleaned in vinegar every few months to prevent calcium buildup. You MUST change the stainless screws used on these pumps. The "stainless" screws will rust away in your system and cause you lots of grief. A freakin mag 5 killed half of my SPS tank

I've been using my Mags for two years now. I haven't changed out the screws. How long did it take for your screws to rust out and corrupt your system?

I ask because Phosban and Rowaphos are a Ferric Oxide (rust basically) and they don't crash tanks. Any insight would be helpful because right now I'm running six Mag Drives. All with original screws.

Thanks,
Russ

Russ,

Mag drives are known to eventually fail your system (the screws rust from the inside out and you can't see it before it's too late) the stuff they are using in Phosban I think is different - perhaps a good candidate for the advanced forum.

House

Good idea Jim.

Russ my mag 5 that was feeding my chiller was 3 years old. It works fine, I have always kept it clean. When I opened the pump the rust was all over! I can't even begin to tell you the awesome SPS that I lost The day after I removed the pump it was like a breath of fresh air. With in a week colors and growth tips returned and most importantly no more STN/RTN

What screws did you guys replace them with?

u replace em with plastic screws... theres certain name for em.. i went into home depot and asked for plastic screws the guy looked at me like a confused puppy.. hahahaha..

I recently swapped a ocean runner for a mag7 as my main return pump and must say i am a little disappointed, it is extremely noisy in comparison. maybe its just mine or something to do with my setup but the low vibration type noise is resonating through the whole house.

i need to find where i can get the screws

Dace, what are your reasons for being so down on MagDrive's? Just curious (don't kill me, I'm not a cat)........

master

INFO ON MAGDRIVE NYLON SCREWS:

Screw size information for Magdrive pumps: 440, 632, 832, 1/4-20 on the link I gave should write like 4-40, 6-32, 8-32, 10-32.... The first number stand's for diameter of the bolt, while the second number stand for number of threads per inch. Example: 1/4-20 is a bolt 1/4" dia. with 20 thread per inch. Screw that have diameters smaller than 1/4", one will use number instead ( 4, 6, 8, 10 ) Ex: 8-32 is mean screw size 8 with 32 thread per inch.

So the 8-32's in 5/8" or item number 91480 (5/8"L x 832 Thread Nylon Round Head Slotted Screw) are the ones to order for Mag's 3-9.5, .

http://www.usplastic.com/catalog/pro...uct%5Fid=15584

I don't have any information on Magdrives above 9.5. So your going to have to measure the screw length and thread count yourself (I don't own these pumps, so I never researched them).