Hayward cartridge filter blow by?

[mammal40]

I have a 24' AG pool with a Hayward ASL Series C1250 cartridge filter. I had a very bad algae bloom when I first opened it, but have gotten that under control. Everything is in balance and I have been maintaining a shock level for a week now and running the pump 24/7, but the water won't clear up. I replaced the cartridge with a Pleatco three days ago and it has gotten slightly better as I can just make out the bottom of the pool now. It seemed odd that it hadn't cleared by now so i dropped a couple tablespoons of cyanuric acid into the skimmer. Low and behold I saw crystals of the acid coming out of the return. It seemed to me that the filter should have stopped them. Can anyone offer any insight?

[mammal40]

An update to my original post, just in case someone ever is looking for something like this...

It turns out, after looking around some, I discovered that the Pleatco filter was not the exact match as I was sold on. I saw a couple of things about the size but it seemed to be about the diameter of the cartridge which I didn't think would affect the way it mounted in the housing. When researching about it I found that a couple others mentioned their soft rubber end caps. The Pleatco has hard plastic ends. I have access to a water jet cutter and cut two gaskets for the top and bottom of the filter out of a closed cell rubber and it did the trick. The filter is running as good as ever. Mind you, this is the last Pleatco I buy...

[PoolDoc]

Thanks for the feedback.

We've been recommending Filbur, Unicel, or genuine OEM cartridges (often made by either Filbur or Unicel!). The information we have received is that Asian made cartridges + Pleatco cartridges have lower over-all quality. So, it's nice to get further confirmation.