Pump is shot. Shopping for replacement...

[CarlD]

Twist-lock is code in my town, too, and the cord can't be more than 3' long.

[mas985]

I wish you had checked in before purchasing. The 3/4 HP matrix has close to the same flow rate as the Powerflo LX 1 HP. 48 GPM vs 49 GPM so you really are no better off. This is why it is generally a mistake to size a pump by the label HP rating. You would have been better off with a two speed on low speed.

BTW, how did you come to 60 GPM? That is much too high for that pump on such a small filter.

[Scrapple]

That is what is listed on the pump label. I will use a valve to throttle the flow rate.

At some point I will post pics of the pool to see if anyone can ID what brand it is. Came with the house, wife won't let me tear it down. I still have to fix a leak around the skimmer. It never ends.

[Scrapple]

Would this one work? Looks like the ends come off and can be threaded into the inlet.

[BigDave]

Inlet of the filter? I don't know if it would thread directly on - you'd probably need a threaded version of that valve and a nipple.
I like ball valves for throttling. PoolDoc recommends gate valves because they're easier to operate.
Hint: When you winterize, set the ball valves to 45 degrees - water is trapped in the valve body when it's open or closed.

[mas985]

When using a throttling valve, it doesn't matter where you put it. The flow rate reduction is the same. However, you are probably better off putting it after the filter so it doesn't collect debris.

But another option is to put some DE into the filter. That will add restriction and reduce flow and improve filtering. At least this way you get something for the reduce flow rate. To get 35 GPM, you want to add enough to raise your clean filter pressure by at least 4 PSI and that should do it.

Also, flow rates on pump labels are meaningless. Those are usually run out or maximum flow rates and not what you typically get on pool plumbing.

[BigDave]

@mas985: Clever idea, DE for throttling. I suppose it would clog up real quick though.

[mas985]

Only if the pool was dirty but isn't that point.

[BigDave]

I just thought of another reason to place a throttle valve between the pump and filter: If there's too much flow on backwash, much sand will be lost.

[mas985]

If that will be an issue, it should be an issue with the existing pump as well. But a good point.