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After purge clams 6 time in salt water 20 mins each, why they still exudate much grime?

I'll add my own pic the next time I buy clams, but [this Youtube](https://youtu.be/30hOXeydZDU?t=69) shows my problem.

[![enter image description here][1]][1]

I  buy clams at Whole Food Market for years. They sell them on ice, not in running water.

[How To Clean Sand Out of Clams | Kitchn](https://www.thekitchn.com/how-to-clean-the-sand-out-of-clams-58389)

> Place all the clams in a bowl and fill it with cool tap water. We’ve also heard that adding cornmeal or black pepper to the water will encourage the clams to spit out more sand.
> 
> Let the clams sit for 20 minutes to an hour. During this time, they will spit out the sand from inside their shells.
> 
> When you’re ready to cook, lift each clam from the water and scrub it to clean any particles or grit from the outside surface. It’s better to lift them individually because straining them into a colander would dump the sand back on top.

I repeat this 6 times...so 20 mins x 6 times = 120 mins of soaking!!! Clams exudate less grime every next time, but even after 6 times, water still has much grime! Why? This happening for a year! 

[![enter image description here][2]][2]

[![enter image description here][3]][3]

[![enter image description here][4]][4]



  [1]: https://i.stack.imgur.com/el6jo.jpg
  [2]: https://i.stack.imgur.com/BvAvn.jpg
  [3]: https://i.stack.imgur.com/oNhwD.jpg
  [4]: https://i.stack.imgur.com/CapQp.jpg
  [5]: https://i.stack.imgur.com/qdbkm.jpg
  [6]: https://i.stack.imgur.com/B8pOE.jpg