| Q: | We have just finished opening our pool, however,
there are stains let from leaves, worms & dead bugs that have discolored the
fiberglass pool. These appear to be surface stains so we think we can remove
them. The company who opened the pool told us to use chlorine to remove the stains. We did not want to do that given we have an ECOsmarte system. The pool is about 11,000 to 13,000 gallons (40 x 16 * 5.5ft - sports pools) When we opened the pool, we used algaecide (for the algae) and muriatic acid (to clear the pool). Since we had to partially drain the pool for some minor fixes to the fittings, the pool was refilled with tap water. We will start regulating the pool this weekend but I wanted to deal with the stains right away. What is out there that we can use? |
| A: | The stains you reference should come up with two five lb
non-chlorine shocks, 24 hours apart with ph at 6.8, calcium at 400ppm or
higher and copper at .3ppm or lower. GLB Oxybrite is the preferred brand but
potassium peroxymonopersulphate at 40 per cent minimum strength as the
active non-chlorine shock ingredient will work. The stains you
mention should come up easily, can be attributed to your late opening as a
rule, but one kilo of ascorbic acid (pure vitamin C) as more difficult to
source would also work with the same starting parameters on your water which
are critical for either method to work.
Start with the non-chlorine shock and move to the ascorbic after four days if for some reason the non-chlorine shock does not pull them. You must turn off any CO2 ph control for two days prior to using ascorbic acid-- and most importantly do not put any chlorine in your pool as it will seal these stains. |