I'm really sorry you are having trouble like this, but regardless of what the seller told you, you're doing things weird and breaking new ground. I didn't see clay pellets in the list of what's included. Are you sure you are supposed to be using them with the liners? It just doesn't make sense to me, but then again I don't know a whole lot about the liners. That's why I asked the guy in the hydro store today about your situation. I was directed to him as the knowledgeable one in the store, and he said that those liners are not designed for spraying systems. You need to feed from above in some manner, probably by a drip system, or have a wick extending out the bottom of the pot, as I mentioned above. Yes, I'm quite proud of that since it was just off the top of my head. Either that or toss the liners. That would be my vote. Spraying is much better IMHO. The guy said you can do something similar to what you are trying, but you are supposed to use the cloth liners designed somewhat for your situation. They have good capillary action and water would get to the clay pellets. They're like $4 for a 6" net pot and not reusable. I'm pretty sure you don't need anything and should just consider spraying the hydroton.

Vortex® Sprayer lifts and oxygenates the nutrient solution, and then gently distributes it over cuttingâ??s bases or root systems.

I'm afraid it aint going to get to the root systems the way you are going about it.

You say it is to keep particles out of the solution. I'm pretty sure this is wrong. That's why they make filters. Or else the liners are for a soil situation and help keep soil particles in the pot. Seems like it would put Coco particles in the solution if anything. Or perhaps it is meant to hold coco fiber growing medium, maybe mixed with vermiculite or something. I'm fairly certain they were not meant to be used as filters, but perhaps you should run them through a couple search engines and see what you can learn. I have a feeling that what happened here is someone wanted to sell you a system that uses the "hot new thing", without really knowing how the thing is supposed to be used or what it was designed for.

Now having said all that. I very well could be wrong since I have not researched Coco liners, or even Coco very much. Hope we helped. Good luck.