Wiz,
thanks and you pretty much got what I was saying from my long post correct.
The part where brought up the rock & sand for the void in the bottom of the pool, was not meant as a suggestion, but rather something I was stating as a personal opinion. When re-reading my message, I guess one could look at it as a suggestion, . . my error.
What I brought up about rock & sand in the pool to fill in the void,was merely for the benefit for those who have taken an active roll in siphoning algae out of the pool. It would make easier for them.