Water is leaking out the backwash while in filter setting. I removed valve handle and do not see anything other than a hard plastic gasket i guess that is broken. It is on the top of the valve handle.

Hi Shari,
I see two possibilities. 1. The diverter shaft o-rings are not sized correctly (or missing). 2. When valve handle was reinstalled it was not oriented properly with the diverter position in valve body.
Hope this helps you.

it's tight to turn because spider gasket is not correct size , if correct new old stock gasket cant be found then entire body of muliport valve needs to be replaced with modern equivelent
this will involve draining down water from entire filter section as glue needed to install doesnt like wet pipes too much and wont stick well leading to leaks , if your not 100%comfortable in doing this your self then a trusted pool service co needs be contacted ,plus who knows maybe they got the org gasket you need?

The "spider"gasket in the backwash valve needs to be replaced. It is not hard to do. If you undo the 6 bolts on top of the valve lid the "key assembly" will lift straight out. Inside the valve body you will see the gasket.

If you remove the bolts around the top the handle and lid assembly will pull out. Under that is a spider gasket that needs to be replaced. Clean out and dry the slots where the spokes of the gasket go, and replace with a new gasket using contact adhesive or vinyl adhesive to glue the gasket in. Do not put anything on the top of the gasket.

It's a good idea to replace the diverter o ring and bearing while you have it open. This requires removing the handle from the diverter. The o ring is on the diverter shaft, the bearing is the white plastic ring that goes between the lid and the handle. After that the backwash valve will work like new.

The water Has to be going out the 'backwash' or 'waste' line.Either that or you have a leak in the plumbing. If the backwash/waste valve is set in the 'filter' position and there is still water escaping through the backwash/waste line, it means that the o-ring or spider gasket needs to be replaced or re-seated. If it is a multi-port valve (one that you spin to select the setting as opposed to a 'push/pull valve) you can try shutting off the pump; do a complete turn, 360 degrees, from the 'filter' setting all the way back to the 'filter' setting. This sometimes helps the spider gasket re-seat

No. That port is there for when you backwash or pump to waste. You normally put a hose adapter there that allows for a collapsable backwash line to be attached when ready to backwash the filter. If it is leaking water there when the valve is set to something other than waste or backwash yuou need to replace the internal gasket in the valve.

The gasket inside the valce is either out of place or damaged. You can rebuild the valve with a gasket set. For a quote on the repair kit, send your valve model number using our contact form at www.arrowpools.net and we can identify the correct kit for you.

The issue is not the filter, but the valve on the filter. There is usually a gasket that seals the different positions of the valve so water does not leak out. This gasket is probably the issue with your filter.

If you have a two piece valve, has screws holding down the handle section to the bottom of valve, then you may have an easier time fixing this issue. You will need to stop your system, release all the pressure from the filter using the Air Release Valve, or take the lid off the pump if you do not have the release valve, wait for about 30 minutes to ensure pressure is released. Then remove the screws around the valve, taking the handle section off in one piece. Check the bottom of the handle piece, see if there is a "spider gasket" or O-Ring that has gone bad.

This is usually a problem with the valve, not the filter. You will need to take the valve apart, look for an O-Ring that has gone bad, usually on the handle (top section) part of the valve. The O-RIng may look like a wagon wheel that is missing a spoke.