Question about Intex Krystal Clear Model 635 Pool Filter Pump 1500 Gph

1 Answer

My pump works when set to "waste" but not when set to "filter". Pool has been out of service for 2 years, we just cleaned it out, painted it and filled it with clean water but the pump is not pumping. what should I do?

Posted by Anonymous on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Intex Master
  • 4,292 Answers

Make sure all plugs are out of returns if ok try recirculate if flow replace sand or possible new mutiport

Posted on Apr 27, 2016

6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 125 Answers

SOURCE: lost my prime in my

if this is a flooded suction and when it turns on it keeps pushing all the water out faster than it is coming in you may have a pump that is too big for the size of the line coming in.
also look to make sure you have nothing plugging the lines going into the front of the pump.

Posted on Feb 26, 2009

  • 77 Answers

SOURCE: Problems with Intex Krystal Clear Model 635 Pool Filter Pump 1500

No, the pump should not be noisy. It sounds like you have picked up a foreign object in the pump housing. you may have to pull the face off to determine. OR the pump/motor is indeed defective and should be returned.

Posted on Apr 28, 2009

  • 20 Answers

SOURCE: the pump/filter combo for my easy set pool doesnt

Prime the pump by filling with water BEFORE youturn it on.

Posted on May 07, 2009

  • 1 Answer

SOURCE: Hi- I'm a new intex above ground metal frame pool

how do I hook up my 1000 GPH intex filter pump?

Posted on Jul 18, 2010

  • 3 Answers

SOURCE: intex above ground pool 15x48 filter pump problems

Get the air out of the filter housing

Posted on Aug 19, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a Hayward s166t sand filter and no matter what setting I have it on tons of water is coming out of my waste line! This is my 1st pool and 1st sand filter!!

I used to work in a municipal swimming pool. 325,000 gallons!

It sounds like you have the sand filter on to clean if water is coming out of the waste line. That is called 'back flow'.

Basically, the water from the pool comes into the top of the filter and the muck settles on the top. You need to add Gypsum (Aluminium Sulphate) to the water which is a floculant. This makes organic material form into a layer on top of the sand. The flocculated layer further adds as a filter. You need to regulate the flow of water into the filter as too fast and you force sand into the pool.

When you clean the sand filter, you do a back flow. So by altering valves, you put the water from the pump into the bottom of the filter and the water lifts the muck and dirt off the top of the sand and discharges it to waste. It is important to also regulate the flow as too much will discharge the sand. That happened in our municipal pool and discharged 6 tons of sand in the space of 2 years.

your owners guide is here. Take a look at the pipes, valves and pump and work out where the flow is going to.

Jul 03, 2016 | Hayward Pool & Spa

1 Answer

Sand filter not filtering! It's been 4 weeks of

Air enters from the front of the pump, usually it is just the lid o-ring (over the pump basket) that needs to be lubed or replaced.
Sand filters do not filter fine particles very well. When vacuuming it is best to set the backwash valve to the "waste" setting. This allows the debris to bypass the filter and go directly to waste. Mind that you are removing water from the pool while on that setting.

Jul 07, 2013 | Pool & Spa

1 Answer

Hayward sand filter

Reference your pressure gauge as the 12:00 position. Going clockwise-
12:00 is Filter, normal running position
2:00 is Waste, water goes from pool and exits the waste line, bypassing filter.
4:00 is Closed, used only when servicing equipment
6:00 is Backwash, reverses water through the filter and goes out the waste line.
8:00 is Recirculate, water bypasses filter and returns to pool.
10:00 is Rinse, water goes through filter and exits to waste line, used briefly after backwashing to clear sediment from filter.
Note that the "pointer," not the handle that you grab, indicates which setting you are on.

May 19, 2013 | Pool & Spa

1 Answer

Sticker wore off on the filter. which button backwashes? the pool is about to overflow.

b> VALVE SETTING FUNCTIONS OF VALVE POSITIONS FLOW DIRECTION THROUGH VALVE FILTER PUMP - TOP - THROUGH FILTER - BOTTOM - RETURN For normal filtration and vacuuming pool through filter. BACKWASH b> PUMP - BOTTOM - THROUGH FILTER - TOP - WASTE For reversing flow for cleaning filter. RINSE b> PUMP - TOP - THROUGH FILTER - BOTTOM - WASTE For initial start-up cleaning, plus resetting filter bed after backwashing. WASTE b> PUMP - WASTE For vacuuming directly to waste, lowering pool level/draining pool. CLOSED b> NO CIRCULATION PAST PUMP PORT For shutting off all flow to filter and pool. RECIRCULATE b> PUMP - RETURN For bypassing filter, but circulating pool water. May be plumbed for "off-system" pool water access. Ideal for Jet-Air® fittings. WINTER b> VALVE NOT IN USE
Ifthis answer does not fix your problem, please comment with additional detailsprior to rating the answer. Positive feedback is appreciated once your problemis solved! Thank you.

Aug 28, 2011 | Hayward SAND FILTER, PRO SERIES

1 Answer

I have a Dreamline sand filter by hayward... it is shooting all debris dright back into pool. It works to put it on waste but not the filter function. Also, if we backwash it is still clean. i havent had...

If the pool filter is blowing sand and debris back into the pool, it is most likely due to backpressure. This is cause by air in the lines. You most likely have a crack somewhere in your system. Start by checking all of your connections and plumbing with your filter and pump. Then start checking your pipes, etc.

Jul 25, 2011 | Hayward SAND FILTER, PRO SERIES

1 Answer

There is about 20 - 30 psi on the pressure guage on the side of my Hayward SP710X62 Vari-Flo Valve. After having set it to waste to vaccum, shutting off and turning handle to filter, I noticed that the...

Hi Jana,

When you back wash your pool you are sending the flow of water from your pump 'backward' through the filter to clean the debris which the filter has removed during operation. Normally, the water enters the top of the filter and exits the bottom to return to the pool, clean. Back washing reverses this process. During back wash, water enters the bottom of the filter and exits the top (with the dirt) and goes to waste. This debris and the water used to wash the dirt away goes to 'waste' ... out of the pool. This is not a problem in the usual sense, it is how the system works, and yes, it is removing water from the pool.

BTW, you don't want to back wash unnecessarily as you are sending money out of the pool when you do this. How so? You paid for the water, you paid to clean it, and you bought the chemicals to put into that water to make it suitable for swimming, (Chlorine, Acid, Soda, Cyanuric Acid, Calcium, Sequestering Agent, etc.), AND you may be paying to dispose of it through sewer charges - and you will have to replace the water and the chemicals you removed during the back wash. If you heat your pool, you also have the expense of heating the replacement water. Thus, you want to keep back wash operations to the minimum required. There should be a sight glass (clear plastic section pipe about 2 inches long) in your waste line. As you back wash, observe the water being sent to waste. When the water in the sight glass becomes clear, you have cleaned the dirt out of the filter. If there is no sight glass in the waste line, discuss this with your pool service company on their next regular visit. If you have no sight glass at this time, I would expect your filter will be cleaned within a few minutes - 5 min MAX. A 1.5 HP pump will move about 50 to 70 gallons per minute while a 2 HP pump will move 60 to 80 gallons per minute, FYI. If you are on a metric system, you can do the approximate rate conversions. With a 1.5 HP motor, in three minutes you have sent about 150 gallons through the filter to waste. You will be able to determine the time required by observing the pressure at the end of each cycle. If 2 minutes of back wash returns the pressure to the start (15# or 20# in our example below), that is what you should use, two minutes of back wash time. Make sense? Please always allow the motor to remain stopped for at least 15 sedonds when you shut it off - before you restart it. This will assure the motor has actually stopped before you start it again. Why? If there is air pressure in the filter, this will cause the pump to run backward for a short period of time. If it is running backward and you start it, you will spin the center out of the impeller and it will have to be replaced.

Normally, when you vacuum, you shouldn't send that water to waste, rather, that water should be filtered and returned to the pool. Why? Why not? The filter job is to remove the dirt from the water, keep the clean water, send it back to the pool.

The only time you must back wash is when you observe an increase in the typical low reading of 10 PSI. If your clean filter operated at 20 PSI, you will notice the pressure will increase as time passes. In this case, when your pressure gets to 30 PSI, that is an indication you need to back wash. Make sense? If your filter operated at 15 when clean, you would clean the filter at 25 PSI. Operating a 'dirty' filter costs you more money through increased effort on the part of the pump to make the water go through the filter. So don't try to save money by not cleaning the filter.

Depending on the size of your pool and the amount of dirt it typically collects, this time frame may be daily or up to a week or more between back washings.

BTW, you should turn your multi-port handle ONLY in a clock-wise direction to avoid damaging the spider gasket inside.

I hope you find this information helpful. If you have additional questions or concerns, tack a comment onto this question and I will try to assist you in what ever way I can. I am a Certified Pool Operator and I have operated a commercial facility for more than 10 years.

Thank you for your interest in Please remember to evaluate this response. Thank you. Now, I am off to the job.

Jul 18, 2011 | Hayward SAND FILTER, PRO SERIES

1 Answer

Installed new pro series sand filter model s244t. same size filter as we had before. bottom drain has been plugged and not in use. can prime pump basket and backwash with limited flow. same thing when...

check impeller may be worn might need replacing scuffing markers change orings too maybe bad seal on pump too push seal out with fingers try running vac on sucktion side of fittings some thing stuck in linerun hose thought it back wash and rinse not waste

Jun 12, 2011 | Hayward SAND FILTER, PRO SERIES

1 Answer

While vacuuming my swimming pool and the valve setting is on filter, the dirty water is returning into the pool. Ive just changed a brand new spider gasket, replaced #20 silica sand. Did i miss anything...

Try changing the setting on your pool filters control valve to waste. This will bypass the filter and vacuum directly to waste. If this works, it could be a problem with the filter's "filter" setting and you may need to service or replace your control valve.

Feb 15, 2011 | Hayward SAND FILTER, PRO SERIES

1 Answer

How to open pool, fill sand filter with water?

I happen to have a copy of the users manual for this pool filter. These are the instructions for operating your filter.

1. Be sure correct amount of filter sand media is in tank and
that all connections have been made and are secure.
2. Depress Vari-Flo control valve handle and rotate to
BACKWASH* position. (To prevent damage to control valve
seal, always depress handle before turning.)
3. Prime and start pump according to pump instructions (be
sure all suction and return lines are open), allowing the filter
tank to fill with water.
Once water flow is steady out the waste line, run the pump for
at least 2 minutes. The initial back-washing of the filter is
recommended to remove any impurities or fine sand particles
in the sand media.
4. Turn pump off and set valve to RINSE position. Start pump
and operate until water in sight glass is clear—about 1/2 to 1
minute. Turn pump off, set valve to FILTER position and
restart pump. Your filter is now operating in the normal filter
mode, filtering particles from the pool water.
5. Adjust pool suction and return valves to achieve desired
flow. Check system and filter for water leaks and tighten
connections, bolts, nuts, as required.
6. Note the initial pressure gauge reading when the filter is
clean. (It will vary from pool to pool depending upon the
pump and general piping system). As the filter removes dirt
and impurities from the pool water, the accumulation in the
filter will cause the pressure to rise and flow to diminish.
When the pressure gauge reading is 8-10 PSI (0.55-0.69
BAR) higher than the initial "clean" pressure you noted, it is
time to backwash (clean) the filter (see BACKWASH under
Filter Control Valve Functions.)

Apr 16, 2010 | Hayward SAND FILTER, PRO SERIES

2 Answers

Dolphin will not climb up walls.

What is you pool surface? It may need climbing rings to assist it on 'slick' surfaces like fiberglass.

Try moving the location of where you set the power supply from use to use to allow it's cleaning patterns to shift around for better coverage.

Jun 07, 2009 | Smart Pool Inc Dolphin Diagnostic...

Not finding what you are looking for?
Intex Krystal Clear Model 635 Pool Filter Pump 1500 Gph Logo

Related Topics:

15 people viewed this question

Ask a Question

Usually answered in minutes!

Top Intex Pool & Spa Experts

Jay Finke
Jay Finke

Level 3 Expert

1338 Answers


Level 3 Expert

4336 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you an Intex Pool and Spa Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides