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Is there a step-by-step how to change the sand in a pac fab super flow sand filter model pf35.

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Try Googling (pac fab)(pf35)(manual) without parens for instructions.

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I replaced a spider gasket on my PAC FAB 2# Multiport valve and when I put it back together the sequence is off. Filter mark is actually the waste port and waste is actually the Filter port.... how do you...

There should be a screw hole in the valve lid that has a flat edge on one side (outside edge). The valve body has a matching flat edge that aligns with it.
In the event the handle was removed from the lid and diverter to replace the diverter o-rings it is not uncommon for people to put the handle back on the diverter 180 degrees of where it should be. The pointer on the handle should be aligned above the open port of the diverter. This is true of all multiport valves except the Hayward four way valve.

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Which port on Pentair Water # 261152 does the pump connect to?

Thank you for posting your question here on

This is a tough question because it is hard to find this info on the web and a different port is used for DE filters and sand filters. On sand filters the top port of the filter is the inlet while on DE filters the bottom port is the inlet. With the valve not connected to the DE filter and in the FILTER position determine which port allows water to flow to the bottom outlet of the filter. This can be easily determined by running water from a hose into the bottom port and whichever is the pump port will have water coming out of it. A similar test can be done for the other ports. I hope this helps.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved! Thank you

Aug 28, 2011 | Pentair Pac-Fab 2" DE Filter Multiport...

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I'm hearing air like sounds around the multiport valve. There's bubbles visible in the filter going to the pump. Bled the air on the filter itself and bubbles continues. Could the multi port...

Air only gets into the lines of your equipment if it enters somewhere on the suction side of the system. That means from the pump housing and strainer BACK to the pool on the inlets. Once the water passes from the impeller out the discharge of the pump it is under pressure and any leaks will result in water escaping from the line.

While your filter may or may not need work air is likely the result of failing gaskets or a seal in the pump. Replace the strainer lid ring, the pump body ring and the mechanical seal first. If there is still air look at the valve or valves in front of the pump for controlling inlet water flow...check for leaking stems or failing pipe joints.


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After changing the sand in the filter, i back washed the system, then i put it on rinse for about 30 seconds. then changed it to filter. after that, it shot outr some sand. so i did the procedure again and...

It sounds to me like your pool filters multi-port valve was not put on correctly after you put the new sand in. Since I can't see your particular filter, I would recommend that you read the section in the users manual about reassembling the valve after you have changed the media. Follow the step by step guide and you should be able to get it back on correctly.

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This site shows a separate part for the strainer body, but I'm not sure it is separate.
Call them with your model number and they can tell you if it unscrews and sell you the repair part that you need.
Worse case, you might have to see if you can remove the entire pump casing and purchase that.

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Sand filter is a week old,has been back wash twice but still having trouble,with kpa over 100

This can be a few different problems I will list them out for you:
  1. Make sure you are following the instructions in your Hayward owner’s manual. The sand bed may be clogged with mineral deposits or other material that will not backwash away. Some calcium based chlorines and other alternative sanitizers could cause a build-up in your sand bed. You may need to change the sand.
  2. Before you change the sand in you filter, try removing approximately 1” of the top layer of sand, and replace with the exact amount of sand removed. This sometimes rids the sand bed of the deposits clogging the filter.
  3. You may have to clean you filter system with a special filter cleaner, check with your Authorized Hayward dealer for proper procedures.
  4. Check to see if there is a closed or partially closed valve on the return piping.
  5. Your pump may be too small to provide sufficient flow for proper backwashing. Your filter will filter properly, but if your pump does not supply at least 60% of the filter’s designed flow rate, you filter will never backwash completely. Refer to the label on you filter for flow rate requirements. It may be necessary to upgrade the pump or downgrade the filter.
Your pump may also be exceeding the maximum allowed flow rate of you filter causing excessive backpressure. Check you Hayward filter owners guide or the operations label on you filter for the maximum allowed flow rate. You may have to downsize the impeller or pump to a lower horsepower or change the filter for one that will accommodate the pump’s flow rate. If allowed to continue, a pump that exceeds the recommended flow rate of a sand filter could cause the sand bed to channel (small channels in the sand that allow debris to pass unfiltered). This would cause debris to by-pass the filter.

Hope this helps you

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I've acquired a plant with a Triton SP-710 sand filter (Pac Fab Filter, 75 gpm rated flow) that is 25 years old -- it is supposed to be cleaning up bearing lubricant water, but a significant amount of grit...

For an old filtering system, there's no other way to clean
it quick but to backwash it with the pump that is hooked to it. Or you can clean and have it rehab by opening it
up which will of course produce a better result. Just
send your e-mail comment for further assistance.

Oct 10, 2009 | Plumbing

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