Bong science, We need a rating system for filtration/cooling

[Cereal4dinner]

Ive been researching bong science or years now. here are the questions that still dont have definitive answers

1. What exactly does a bong or dab rig filter out?
2. How exactly do different water levels and perculators affect the filtration/ water cooling. (need smart people to study) I want exact numbers
3. How much thc is lost in the filtration process if any

My end goal is to create a guidence chart for people looking to purchase a bong or rig.

A 1-10 rating system for things like filtration/cooling, flavour muting, air flow, mouth splash, pull rating (does it rip, chug)

Whats everyones thoughts on this, I think a generic rating system would help people pick rigs for their needs

 

[AcidFlashbang]

http://www.cannabis-med.org/index.php?tpl=journal&id=230&lng=en

TL;DR: smoking through a bong reduces total tar, but also reduces the ratio of THC:tar making it worse for you by causing you to consume more tar to get the same level of THC as a joint. Vaping is not tested through a bong in this study. Interestingly it seems that the more smoke-water contact a bong produces, the worse the ratio gets; likely because THC sticks to the particles that become trapped in the water.