Oh darn Marckszoom.... sand never needs changing. But it sure can get dirty and a good cleaning always helps. Adding DE works well too towards the end of a SLAM when that last little bit of schmutz is still hanging about. WHen you toss in mass quantities of liquid chlorine, the FC is only going to work so well and a lot of that extra will just fade off in to the sunset faster. And your vinyl can take a huge hit and fade with that extra high chlorine level. That you're only using test strips makes things harder to monitor because they can be very inaccurate. You've got a big honkin' pool...you need a really good test kit like the TF-100. Floc and clarifiers can gum up your new sand.
Thank you YS. I actually have the Taylor test kit but never got to update my profile. My pool liner is 12 years old and it's faded anyway, has one patch and several small sink holes. I am not replacing until it blows. I enjoy the clear water either way. The ocean is not perfectly smooth either LOL. I am sure that I faded about 20 gal of liquid chlorine right into the NY skies, but I was so terrified by the water that I wanted to make sure nothing lives. It made me dry heave it was so bad. Now it's almost clear. Shallow end looks clear but still lightly cloudy 8 feet down where i have to strain to see the main drain. All levels are good IMHO. Hardness does not matter with vinyl anyway. So why is it taking 2 weeks? I guess it's either do I run the pump 24/7 for another week or do I add DE now and clear it faster. I do enjoy the constant stable pressure due to new sand though. I re-sealed all the connections above ground to prevent any air coming in. The skimmer is so strong it can suck you finger in and hurt it.
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