Im a service manager at an apartment complex and im the cpo. Ive been reading tfp for a few months and have used all the tips and tricks you guys do to help me run my 115000 litre pool and 5000 litre whirlpool. The last two weeks I've been studying the borate addition and thought I would try it in the whirlpool. used the pool calculator and it worked out great using ma and borax. my water has always been crystal clear in both pools but the whirlpool sure has better feeling water. Very pleased I found this site. Can't wait to try the borates in the main pool. Thanks everyone! Oh forgot to add that the ph rise from areation sure is slower. Pretty cool addition.