Every day we have folks asking us how much vacuum is good vacuum and how long before they see result. Following are some simple recommendation to help you start your pumping regimen. Pumping is mostly an experiment-based knowledge and it will take a short time before you get into your own rhythm. 
For the best pumping result, always try to keep your pubic hair at shortest length possible, to get the less leak and better seal possible. Other external factor is lubrication such as bostonpump.com PUMPING LUBE is highly recommended. Extra heat such as warm towel wrapped around the cylinder is recommended. The external heat can help you to warm up your skin better and make it less susceptible to skin stress caused by pumping. However Usage of electrical heating pads are not recommended due to high risk of electrical shock. 
The amount of the pressure is very relative and varies for each individual. Adjust the vacuum frequently and increase the vacuum stage wise. Don╝t pump to high level of vacuum suddenly. Our experience tells us that when you build vacuum over the longer period of time you will see a better result with less skin damage and irritations. If you want the result to be more of a long term, apply medium pressure for a longer amount of time. Remove the cylinder every 12- 15 min and massage yourself with pumping lube to distribute the blood flow evenly. For the best result, massage yourself in all directions. 
It is hard to say how much your growth will be because experience shows that even when pumped in regular basis, in an optimum level, some pumpers experience a plateau in their growth regimen. This only can be explained as a factor of genetic potential inhibition. In other words, one can pump a lot and get little result and another person can pump little and get a lot of result. Find your limits and plan your pumping regimen around that. 
Always maintain a good amount of cavity in the cylinder for the optimumexpansion both in the diameter and in the length. Remember to updates your cylinder size as your growth become more visible.
What is assuring is when using a good pumping instrumentation you will definitely see results. And that is proven.
If you like to share your experience with others and us please send us an email and we will be happy to post it for you. You willalways beanonymous

NOTE: www.bostonpump.com is not responsible or liable for the ideas and experiences shared in this page and/or in this site.
REMEMBER: ALWAYS USE YOUR COMMONSENSE AND KEEP YOUR EQUIPMENT OUT OF REACH OF CHILDEREN