This is the tank that came with the istick 50w, its unbranded, does anyone know which tank it is and how you open it to fill??? no instructions as second hand
I have no clue what brand that tank is. It does look like a bottom fill sub tank (use LOW nic juice in it). Higher nic juice will be very harsh in this tank.
To open, hold upside down, grasp the glass in one hand and then unscrew the bottom part. The bottom part should have a "coil" (atomizer) in it when you unscrew the top with glass. (sometimes the coil will unscrew attached to the top, no biggie). The coil should have markings on it on the side, like the name brand and resistance (.5 ohm?) or possibly the recommended power range. That would be the only manner I would know to buy new coils for this tank.
To fill keep upside down. Make certain the "coil" (also known as a coil head or atomizer) is snugly screwed into the bottom of the tank. Fill the top part of the tank up to the "chimney" the center tube in the top part. Then screw the bottom with the coil back onto the top.
Coils are meant to be primed. Inside the coil head is a wire and some cotton which sucks or wicks the juice to the wire for vaporization. With a new coil we usually drip a few drops of juice directly onto the cotton when the coil is in the bottom part BEFORE reattachment to the top. Then after filling and re assembly take a few UNPOWERED draws to suck the juice into the coil. We usually let the tank sit right side up for about 5 miunutes so natural wicking can occur. Then turn the power down on the iStick. Take a hit, bump it up and repeat. If it gets to taste funny, too warm or taste burnt, back the power down. Once you toast the cotton in a coil all you can do is replace the coil. This is pretty much the same method you will use with every vape device you will ever use.
The "mouthpiece" is called a drip tip. 90% of drip tips will fit in it (standard size is called a "510" drip tip) However I have found in a couple circumstances the Aspire brand drip tips are not interchangeable in many tanks of other makers. Cheap ($1) 510 drip tips will probably fit this larger tank. I swapped out all of mine for a more narrow drip tip as I prefer to mouth to lung vape and really don't enjoy feeling like I'm sucking on a car exhaust.
You're doing great by the way
