Recent content by DHinNC

No air in the basket, but not too long after the pump stops I can see through the clear cover that the DE flows back into the filter basket.

Is a bad seal in the multiport valve the most logical cause of this issue? There is a lot of cavitation like noise coming from the valve.

Yes it's coming back through the filter. There is no air in the filter. It is siphoning back into the pool through the skimmers and main drain. Never had this happen before.

Recently I replaced the DE filter grids without any issues. Just observed that the filter is back flowing through the pump when the timer shuts off. I don't have a check valve between the pump and the filter. Could this be a problem with the multiport valve on the Pentair DE filter? The DE...

Ok thanks. My local pool store doesn't stock the purple stuff - they recommend the magenta stuff for the SW pools. They said it was higher concentrate and would take less volume for my pool size. I actually bought 2 bottles. Would it be acceptable to use the remaining bottle as the...

ok here's my issue: Salt pool Opened pool to liner stain. Chlorine reduced to 0- added Stain Free= clear liner overnight Added 1 qt of Jacks Magic Magenta Stuff and slowly start adding chlorine (bleach) adjusted ph with washing soda plus added CYA now 2 days later the pool water turned a light...

OK, then I'll just continue with raising the TA with the chlorine generator set at a lower % and see if the water clears up in a few days, right? thanks for the input!

:grrrr: Ok- Wednesday afternoon and when I check the pool--- I can't see the main drain in 6' of water!!! What happened? I tried raising the TA before turning on the chlorine generator as recommended so there hasn't been any chlorine in the pool since the AA treatment, only Polyquat 60...

Ok, so I did the AA treatment Sunday and the stains disapeared just like it says in the instructions given here. After adding ~2 lbs. of the Abscorbic Acid and a bottle of sequestrant the test results showed- Total chlorine = 0 ph = 6.8. 24 hours later I was ready to add sufficient quantity...

No- the wing nuts at the top are SS. The captivated nuts underneath the lower grid support are SS. The plain nuts on top of the lower grid support are plated brass per the FNS Plus owners manual "Item 12 Part Number 98211400 Nut, 1/4-20, plated brass". These are the ones that were corroded...

Brice thanks for the reply. I found out today that the material of the nuts was plated brass not SS as originally thought. This is from the Pentair FNS -Plus Manual. I feel fairly confident now that there was some galvanic interaction between the different materials and that the plated brass...

Thanks- that's one of the thoughts that I had that the 2 nuts that corroded were not the same quality of SS as the rods or the captivated nuts on the bottom of the plastic grid support nor the thumb nuts at the top of the grid. None of those had any corrosion on them. I'll be keeping an eye on...

I have a Pentair FNS 60 square foot DE filter on an inground pool. Anyone have any problems with internal corrosion on the SS nuts that are used on the rods that holds the filter grid assembly together? The pool is a salt water pool that is just now 5 years old. Today when I disassembled the...

Dave- Probably need to clarify that draining the water in the pool was limited to just getting the level down to normal skimmer level. Once this was completed, the pool suction valves were closed and the valve that provides suction to a drain field under the pool liner (below the main drain)...

Had ~12" of rain on Labor day and on the 2nd time draining water out of the pool, noticed that the liner was floating in several places. Mainly the areas were at the walls, but a couple were in the deep end close to the main drain. When the pool was built I had the pool builder plumb a...