Tennis courts are easy ( in method )
DS CHL - not with a chem tip, a slightly closed ball valve ( to create a semi-fan spray ). It will put out 2-3x times more chem this way. We don't use soap with the courts. Rinsing IMO would take way to long,
and if not rinsed good enough - a FALL hazard.
On the last set of courts we used approx. 20 gallons of chemicals
We spray twice and let dwell. A long time. ( 10 minutes or so per DS'ing )
Now its rinse time.
Use VOLUME not pressure and NO DISC CLEANERS.
I don't care what anyone tells you....
- I'll walk faster......It only takes 1 brief second to tear up the thin layer of paint ..and if you could do it without stopping you'd put whirl marks down
So we use our 8 gpm machines with wands and huge tips, remember the chemicals did the work YOUR JUST rinsing the dead algae away.
If you see black and think its algae and a soap tip doesn't remove it, it is probably the asphalt showing through the paint.
GUM - your hosed here, sometimes the heat alone will remove the paint with the gum.
Obviously your NOT going to use a 25 tip on the gum. We have seen many courts with holes in them from that "last guy" that did the courts.
Last but not least ....
Tell the customer that the court will lighten from the chems.
I think that I spoke with 4 or 5 local installers here and they all said that the only time they use a disc cleaner is when they are prepping the court to be refinished.
I can think of more, but that is the most of it.
Nice