Just tried a strip after vacuuming and swimming a little to see what the FC reading was. It shows around 4.

So hopefully you guys have all the info you need to let me know how much of the 18 gallons of 6% I need to dump in. Not sure how I would monitor it for I have nothing that goes to around 15ppm. The test strips do show up to 10 so maybe a darker color than that.