Pump

[blue dog]

Here,s one for ya.
Buddy stops by to give me a pump for my 265. looks like a dart pump,all it says is that it
is a 3/4 hp motor. He says he used it on a jet tub, how much would this pump and would this work on my tank???

 

[fragmatic]

Does it have metal parts exposed to the water? If so, no. If not, sterilize it and go for it. It is most likely 265 per hour with no head height... that is my guess.

 

[ReeferBob]

3/4 HP uses a LOT of electricity! It will be cheaper to get the proper sized new pump.

 

[blue dog]

The pump parts are plastic, was hoping that is would do better than 265, I have 2 mag 18 that do better.

 

[fragmatic]

That 265 gallon pump with 3/4 Hp is most likely designed to handle a good bit more head height than you will need with a reef tank system. Although it only moves 265 gallons, ... at 25 feet up a two story building it will deliver a lot of water and our aquarium type pumps may not deliver much at all.

 

[blue dog]

I was hoping it would pump out a lot more than 265, that is just number some one had said it might pump out.
How would i find out??

 

[fragmatic]

Run a test. See how fast it pumps X amount of water.... and do the math.

After it starts pumping water from a large container, put the output hose into a five gallon bucket and have someone watch a second hand. When the bucket is full note the seconds. Then multiply.

 

[ReeferBob]

Since you seem to be ignoring my post on costs, I did a comparison for you with the cost difference between that pump and an Eheim 1262 (900gph/12 foot head). Are you paying the electric bills?

Your Pump - 900 watts - $108.86/month $1,415.23/year (900 watts is about average power draw for a 3/4 HP electrical pump)
Eheim 1262 - 80 watts - $9.68/month $125.80/year

Hopefully you can see how foolish it is to use a 3/4 HP pump designed for 20-30 minute at a time use in a hot-tub 1 to 2 times per week in a 24/7/365 situation. I also doubt that pump was designed for continuous duty like aquarium pumps are.

 

[blue dog]

Hi. Now those are numbers i can see, thank you. And yes it would be very foolish to use this pump for any thing other than what it was intended
for. I was planning on putting a mag 18 on each out let, or is this to much?. Sorry forgot to mention my project is a 265 going into the wall

 

[blue dog]

I think what i might do is put one mag 18 in a closed loop, this way there won,t be to much going through my sump

 

[ReeferBob]

I think 2 mag18s are way too much - they are 1800gph. I think you could get away with a single 1200gph or 1800gph. With a closed loop you don't need anywhere near that rate. I'd start with a 1200gph pump with a gate valve on it and see if that is enough pump. Add as needed but I suspect a single pump will be plenty. You could probably run 2 returns and a reactor on a 1200gph pump.