Pentair SuperFlo Leaking From the Strainer Pot? How to Fix It (Model 353010)
A puddle in front of your pump is never good news. On a Pentair SuperFlo, that water almost always comes from the strainer pot, which is the basket housing with the clear lid on the front of the pump. Sometimes it is a cheap o-ring. Sometimes the pot itself is cracked and the only real fix is a new one, part 353010.
Here is how to tell the two apart before you spend any money.
Why is my Pentair SuperFlo leaking at the strainer pot?
Most strainer pot leaks come from one of four spots. Only one of them means you need a new 353010 strainer pot.
- The lid o-ring. Dried out, flattened, or twisted in its groove. This is the most common cause and the cheapest fix.
- The drain plugs. The small plugs on the bottom of the pot have their own o-rings, and they get brittle after a couple of seasons.
- The pipe connections. Water at the inlet or outlet threads is usually a plumbing or union issue, not a pump issue.
- A crack in the pot body. This is the one that puts you in the market for the 353010.
How do I know if the strainer pot is cracked?
Dry everything off, then run the pump and watch. If water reappears somewhere other than the lid seal or a plug, and it keeps coming back after you replace those o-rings, the pot is cracked.
A few things to look for:
- Wipe the whole pot with a dry rag, run the pump for two minutes, and look for the first bead of water. That spot is your leak, not wherever the puddle ends up.
- Hairline cracks usually show up around the threaded inlet, around the drain plug bosses, or along the seam where the pot meets the pump body.
- Some cracks only leak when the pump is running and pressure is up. Others only weep when the pump shuts off and water settles. Check both.
- If the crack is above the water line, you may see air getting sucked in instead of water leaking out. That shows up as a basket that never fills all the way, or a pump that loses prime.
If you are chasing a pump that will not hold prime and you have already ruled out the lid o-ring, a cracked strainer pot is worth a close look.
What causes a SuperFlo strainer pot to crack?
Freeze damage is the big one. Water left in the pot over winter expands and splits the plastic, and you often will not find out until you fire the pump up in spring.
The other usual suspects:
- Overtightening the lid or the drain plugs. These only need to be hand tight. A wrench will crack them.
- Rigid plumbing with no unions, so every bump to the pipe puts stress on the pot threads.
- Dropping chlorine tabs into the strainer basket. That is very hard on the plastic and on everything downstream.
- Age and sun. Fifteen years of UV makes any pump housing brittle.
How to replace the Pentair 353010 strainer pot
This is a straightforward job for most homeowners. Plan on an hour if you have unions, longer if the pot is glued straight to hard pipe.
- Turn the pump off at the breaker. Not just at the keypad.
- Close your valves and pull both drain plugs to empty the pot.
- Loosen the unions or cut the pipe if there are none, then unbolt the pot from the pump body.
- Pull the old pot forward and clean the mating surface. Scrape off any old gasket material.
- Set the new 353010 in place with a fresh housing gasket, then snug the bolts down evenly in a crossing pattern. Do not crank them.
- Use fresh thread sealant on any threaded fittings, and hand tight is enough on plastic threads.
- Fill the pot with water, put the lid on with a lightly lubed o-ring, open the valves, and start the pump. Watch the seams for the first few minutes.
Replacement cost: is a new strainer pot worth it?
In most cases, yes. The 353010 assembly costs a fraction of a new SuperFlo pump, and the motor and drive on your pump are the expensive parts. If those still run fine, replacing a cracked pot is easy money.
Lean toward a whole new pump if the motor is also failing, if the pump is old enough that parts are getting scarce, or if you are still running a single speed pump and your area now requires variable speed. In that case you are paying for an upgrade, not just a repair.
Parts worth ordering at the same time
While you have the pump apart, it is cheap insurance to refresh the wear items:
- Lid o-ring and drain plug o-rings
- Strainer basket, if the old one is cracked or crushed
- Housing gasket between the pot and the pump body
- Silicone based o-ring lubricant and thread sealant rated for pool plumbing
Doing all of it at once means you are not back out at the pad next weekend chasing a second leak.
Quick recap
Check the lid o-ring and drain plugs first, since they cause most SuperFlo leaks and cost very little. If the leak survives new o-rings, or if you had a hard freeze, look for a crack and plan on the Pentair 353010 strainer pot. It is one of the more forgiving repairs on a variable speed pump, and it saves a pump that is otherwise perfectly good.
Not sure this is the right part for your problem? Reach out and we will help you figure out exactly what you need before you spend money on the wrong thing.