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【多选题】
过滤过程中,关于水头损失和滤池运行的说法正确的是()。A.
过滤开始时水头损失最小。
B.
过滤水头损失达到最大出现悬浮物泄露时需要进行反洗。
C.
随过滤进行，悬浮物截留在颗粒间隙，使的表观流速增加，水头损失逐渐增大。
D.
为了保证正常的过滤运行，一种方法是提高水位，以抵消增大的水头损失，保持流速不变（等速过滤）；一种是保持水位不变，滤速逐渐减小（变速过滤）。
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