Bestway 18 ft pool dirty... cant get it clean

gtnos

Well-known member
Jun 9, 2013
549
Newcastle, Oklahoma
Ok. Let me start with chemistry. Taylor K2006 tests

PH - 7.6
CC - 0
FC -26
TA - 90
CYA -50

Pool water looks dirty. Its clear... but dingy.

Pool is still covered. I hooked everything back up last week and got it circulating. As im sure you are all aware, temps in the south (im in Oklahoma are warmer earlier this year) my water temp under the winter cover was 60 and my FC was at 1ppm but 0 CC. That worried me so i immediately slammed it with bleach and its still under slam. Water looked crystal clear before slam but there was a ton of dirt on the floor.

I just bought a new dolphin escape with nano filters and its gotten a workout as ive ran it probably 10 times, each time it was full of dirt. Running the dolphin has dirtied the water and i cant get it to clear up.

I think im having a filtration issue. 2nd season on this setup. I am running a sandfilter / pump combo rated for a 8000 gallon pool. My pressure gauge this year seems to not be working. Ive let pump run for 72 hours straight to try and clear it up. When i backwash after this long run, water is clear coming out of backwash hose... and it should be dirty.... especially if i was having an algae issue and im slamming but its clear. Return jet stream is strong... not acting like a dirty clogged sandfilter would.

Do i need a new sand filter? New sand? I dont think its a algae issue as
 
Ok. Let me start with chemistry. Taylor K2006 tests

PH - 7.6
CC - 0
FC -26
TA - 90
CYA -50

Pool water looks dirty. Its clear... but dingy.

Pool is still covered. I hooked everything back up last week and got it circulating. As im sure you are all aware, temps in the south (im in Oklahoma are warmer earlier this year) my water temp under the winter cover was 60 and my FC was at 1ppm but 0 CC. That worried me so i immediately slammed it with bleach and its still under slam. Water looked crystal clear before slam but there was a ton of dirt on the floor.

I just bought a new dolphin escape with nano filters and its gotten a workout as ive ran it probably 10 times, each time it was full of dirt. Running the dolphin has dirtied the water and i cant get it to clear up.

I think im having a filtration issue. 2nd season on this setup. I am running a sandfilter / pump combo rated for a 8000 gallon pool. My pressure gauge this year seems to not be working. Ive let pump run for 72 hours straight to try and clear it up. When i backwash after this long run, water is clear coming out of backwash hose... and it should be dirty.... especially if i was having an algae issue and im slamming but its clear. Return jet stream is strong... not acting like a dirty clogged sandfilter would.

Do i need a new sand filter? New sand? I dont think its a algae issue as
Do an OCLT to rule out algae. If you pass you can assume it’s just dirt in the water.
 
You may want to check your laterals and stand pipe- maybe something got broken or came loose? Be sure your mvp is orientated properly as well.
It might be a good time to do a deep clean of the sand while you’re in there. Sand really doesn’t go bad unless you gummed it up with floc or clarifiers but it does need a deep cleaning every couple seasons.
They sell pool filter gauges at lowes for cheap.
Slam level is 20ppm for a cya of 50
FC/CYA Levels no need to go over - it just wastes chlorine & risks damaging your liner & equipment.
 
It's been my experience helping so many others, that sometimes it takes quite a while (days) to clear all the dead algae out even though you have 0 cc's and your FC is holding as it should.

Per the SLAM instructions, you should clean your filter when the psi is 25% above whatever the "Clean" pressure is. Depending on how much algae you have and how big your filter is, this might mean a whole lot of filter cleaning.

In a lot of cases, I've seen a lot quicker results clearing the water up by turning off the pump for several hours or perhaps overnight. Much of the dead algae suspended in the water will sink to the bottom, then vacuum it out, and repeat.

As a note: I know zero about the filters supplied on Bestway pools, so do what the filter will let you do with it.
 
Last edited by a moderator:
  • Like
Reactions: Mdragger88