I would really appreciate some advice re pump timing on an infinity edge pool with a trough. Last year (I am down south so my pool season is the winter) I had an outbreak of black algae and I sure as heck don't want it back.
OK - two Intelliflo VS pumps, one circulating the pool water from floor drains in the main pool via filter and SWG to returns in the main pool and the other ('edge pump') bringing water from the floor drains in the trough back to dedicated returns in the main pool via separate filter. Currently I run the main pump at 1200 rpm and the edge pump at 1500 rpm. (Both pumps run at higher rpm for 1 min each time they kick in). Electricity is expensive so I am open to all advice regarding time/rpm.
My fill water has high TA (300); running the edge pump and circulating water over the edge (65') leads to high rates of evaporation and a rapid rise in PH, requiring more fill water at TA 300 and endless acid. I therefore want to minimize use of edge pump, but I am now really nervous about leaving water uncirculated in the trough for too long. How long is it safe for the trough water to sit without being recirculated? (I am aiming for 4.5 to 5 ppm chlorine.) Trough holds about 1500 gallons.
Last year I basically ran the pool pump for about 12 h on /12 h off (off overnight) and the edge pump for about three 1-hour runs staggered through the day - and I ended up in trouble. I am thinking this year I should spread circulation times on both pumps round the 24-h clock. I am thinking I'll go with about three 6-hour runs with three 2-hour intervals on the main pump (?), although I would quite like to reduce this to three 5-hour runs with three 3-hour intervals if that was safe. I have no idea what my best plan of action is with the trough...
All help gratefully received.