How to backwash sand pro 550 - Hayward SAND FILTER, PRO SERIES

SOURCE: sand filter problem

The pump is to big for the pool. So with that being said it is asking you to back wash more then you should need to because it is pulling water at a much higher rate then what your pool is actually calling for. I would recommend taking it down to a 700gl and this would solve your problem. Also you can replace the drain lines and suction lines to smaller lines and that will also take care of the issue at hand but I do not recommend that at all

SOURCE: sand in backwash

You need to replace the seal in the head unit of the filter.. The sand should be replaced every three years or buy a cleaning solution.

SOURCE: sand is in pool after backwash

A little sand is normal, called a puff back. Anything more then a good pinch of sand is a problem If its a lot of sand you can check the following.
1. O-ring in side the filter valve when standpipe inserts is intact. Make sure that standpipe is not cracked and seats well into valve.
2. check spyder gasket inside filter head. (looks like a wagon wheel) if it is loose or is pulling up it will need to replaced or re-siliconed. A good indication of this being the problem is if water is leaking from backwash port.
3. Check hoses to make sure that the to pool, to pump conections have not been reversed, if this was case you would get a lotta sand into pool. (can empty tank)

SOURCE: sand in above ground pool

what type of sand make sure its for pools should only have 2 bags max in filter

SOURCE: stuck multivalve head handle

that means the filter is sendind sand back to the pool if it does the filter latteral must be replace . not a easy job