I have an IG Vynal 24.5K gallon pool with a Quad 60 D.E. filter. I can't remember the pump HP but the system is old since the plumbing to the pump from the pool is only 1.5". I did a spring cleaning to the filter system 4 weeks ago. It didn't look bad after running all winter. My chemicals that I checked with my kit were good but I have had an issue with algae this past week. I have been doing the BBB method for over a year now. I tried to clear up the algae by putting in 4, 1.68 gallon jugs of 6% chlorine in and brushing the entire pool down. It must have done something because the next day I had to backwash the filter, it was at 24psi. When clean and freshly charged with D.E. it is at 14psi. I added more chlorine and brushed down again after back washing the filter, so I'm thinking I will have to backwash again tonight when I get home from work.
The pool store is telling me I need to do a partial drain to get my TDS down. My questions is do I have too? What caused it to get so high. Over the course of two years it went from 1200 to 2200 to now 3000. The last time I added water was Aug last year. The rest of the time the pool has been kept full by all the rain we have been getting here in Eastern NC. When I do fill the pool it is from the town water, not well.
Did I mess up by not vacuuming the algae that was on the bottom to waste? Should I take the filter apart and clean it out again to get rid of what might still be inside the filter? Some times I get ahead of myself and this time I'm thinking I did.
Thanks for any and all help.
Here is the water test figures.
Saturations indx: -1.3
Tot. Chlorine: 1.8
Free Chlorine: 1.8
Totl Alkalinity: 54
Adj. total Alk: 42
Tot. Hardness: 139