Gravity bag & pre-filter w/ pop bottle threads

[Ken M]

Gravity bag from old 2 L Platypus.  PVC pipe pre-filter turned to snug fit to inside of platy spout (does not leak) and has a male pop bottle thread glued to lower end.  Sawyer filter now screws on to pre-filter.  Filter media is polyester fill rolled tightly  and inserted into PVC with about 1 inch sticking out inside of bag for a course filter.  Optional small bag of activated charcoal loads into bottom of pre-filter to improve taste.  Water for testing was from turbid pond.

At home, another adapter from female pop bottle thread to garden hose allows quick back flush (at low pressure)

Total weight to service 2+ people is 8.6 oz.

[Paul McLaughlin]

What kind of glue did you use for PVC to PET?

[Ken M]

Adhesive is an ACYRIC hot met glue.  I find that the acrylic is somewhat soft and pliable but sticks well…hard to remove from the PET or PVC.  Rated for use around food.  The acrylic formulation worked better than any other type of adhesive or hot melt I tried.

Specifically I used a Surebonder product that was labled “Acryl Stik”.  It was available at hardware/craft stores in 10 stick packages and a bit more pricey than other hot melt.  I will not give a catalog number as Surebonder has just recently (2019) changed that product but kept the same catalog number (and UPC code).  Bad business!  The new product is NOT the same and does not work well.

There are other makers of acrylic hot melt but I have yet to find one that I can purchase in small quantites and test.

[Author]

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