You posted while I did.

Ok. Read the muriatic acid guide, also in the blue signature bar. Purchase a gallon, and use it -- safely - you DID read the page, RIGHT? -- to lower the pH.

Add the bleach as previously instructed -- 4 gallons each evening. Ideally, do so THIS evening.

Let the pump run on low speed at night. However, if you add the bleach via the skimmer ( NO other chemicals in the skimmer!!) it will likely help the filter. Sounds like you still have algae growing. Live algae stops DE filters up FAST.

Actually since you have a concrete pool, and seem to have algae, make your FIRST dose 8 gallons -- around 20 ppm of chlorine. With a CYA of 0, that should kill all growing algae overnight. But till you have CYA in the pool, you'll need to continue to dose each evening.

Once the algae is all gone, and there are no more filter problems, you can drop back to 2 gallons per night.

Once you have the algae dead, the pH down, and the pool running reasonably well, re-test all parameters and report back.